| 1. |
- Bengtsson, Ingemar, et al.
(författare)
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Marknadsanalys
- 2024. - 15
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Ingår i: Fastighetsnomenklatur : Fastighetsekonomi och fastighetsrätt. Institutet för värdering och Samhällsbyggarna. - Fastighetsekonomi och fastighetsrätt. Institutet för värdering och Samhällsbyggarna.. - 9789144182636 - 9789144191072 ; , s. 263-285
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Bokkapitel (populärvet., debatt m.m.)abstract
- Marknadsanalys handlar i fastighetssammanhang i grunden om att undersöka fastighetsmarknaden i syfte att förstå hur fastigheter prissätts på marknaden. Det i sin tur handlar både om att förstå hur fastigheter i allmänhet prissätts och hur specifika fastigheter prissätts. Det förstnämnda handlar om prisnivån på fastighetsmarknaden och det andra om priset på en specifik fastighet. Det här kapitlet handlar om hur man kan strukturera en marknadsanalys i samband med att man värderar en fastighet och vilka faktorer som behöver undersökas. Kapitlet baseras på beskrivningen av marknadsanalys i läroboken Fastighetsvärdering – om värdeteori och värderingsmetoder (2023) av samma författare. Föreliggande text är en komprimerad och delvis omskriven version av flera olika kapitel i nämnda bok. Fokus ligger här på kommersiella fastigheter och bostadshyreshus, vilka också ryms inom begreppet avkastningsfastigheter.
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| 2. |
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| 3. |
- Gustafsson, Ingemar, et al.
(författare)
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An inter-day assessment of the ABC parameters in the evaluation of progressive keratoconus
- 2021
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Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 11:1
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Tidskriftsartikel (refereegranskat)abstract
- The progression of keratoconus is commonly determined by comparing the results of corneal tomographic measurements on different occasions. However, investigations on the repeatability of measurements are commonly performed within the same day, thus not taking the inter-day variation into account. The effect of keratoconus disease severity on the measurement error is also seldom considered. In this post hoc investigation, the parameters A, B and C in the Belin ABCD Progression Display were evaluated in relation to disease severity in intra-day and inter-day measurements. Four consecutive measurements were performed on 61 patients with keratoconus on the same day (intra-day). In another cohort, four consecutive measurements were obtained and then repeated 3 days later in 25 patients with keratoconus and 25 healthy controls (inter-day). The results suggest that the diagnosis of disease progression would benefit from inter-day measurements, and the stratification of the parameters A and C according to disease severity. It is also recommended that tomographic systems such as the Pentacam HR be modified to allow the comparison of both single measurements and the mean of replicate measurements of the parameters used in the assessment of progression of keratoconus.
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| 4. |
- Gustafsson, Ingemar, et al.
(författare)
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Association between keratoconus disease severity and repeatability in measurements of parameters for the assessment of progressive disease
- 2020
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Ingår i: PLoS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 15:2
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Tidskriftsartikel (refereegranskat)abstract
- Background Progressive keratoconus can lead to severely impaired vision, but there is currently no consensus on the definition of progressive disease. Errors in the measurement of the parameters commonly used to establish progressive disease were evaluated in an attempt to determine the limits at which a true change in the values can be detected. The possible association between measurement error and disease severity was also investigated to evaluate the need for limits based on disease severity. Methods Sixty-one eyes were studied in 61 patients with keratoconus. Four replicate measurements were made in each patient using a Scheimpflug-based tomographic system (denoted the PC) and an auto-keratometer (denoted the AK). The repeatability coefficient, i.e., the level below which differences between two measurements are found in 95% of paired observations, was calculated. Patients were further divided into three groups based on disease severity (parameter magnitude). Results Increasing magnitude of all the keratometric parameters investigated was significantly associated with increasing measurement errors, and thus worse repeatability. The maximum keratometry value (Kmax) was the least repeatable parameter (1.23 D, 95% CI 1.11–1.35 D) and showed the strongest association between parameter magnitude and measurement error. The repeatability coefficient ranged between 0.32 and 1.62 D, depending on disease severity. The most repeatable parameter was the flattest central keratometry value (K1), measured with the PC (0.51 D, 95% CI 0.46–0.56 D) and the AK (0.54 D, 95% CI 0.48–0.59 D). K1 showed the weakest association between parameter magnitude and measurement error. The repeatability coefficient for K1 ranged between 0.40 and 0.54 D when using the PC, and between 0.34 and 0.70 D when using the AK in the three groups. Conclusions The association between the magnitude of the keratometric parameters and their measurement errors suggests that limits should be based on disease severity to ensure reliable detection of progressive keratoconus. Further studies are, however, required.
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| 5. |
- Gustafsson, Ingemar, et al.
(författare)
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Current clinical practice in corneal crosslinking for treatment of progressive keratoconus in four Nordic countries
- 2023
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Ingår i: Acta Ophthalmologica. - : Wiley. - 1755-3768 .- 1755-375X. ; 101:1, s. 109-116
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: To evaluate clinical practice in the diagnosis and treatment of progressive keratoconus with corneal crosslinking (CXL) in four Nordic countries.METHODS: A questionnaire was sent to all centres at which keratoconus patients are evaluated and CXL is performed in Sweden, Denmark, Norway and Iceland. Nineteen of 20 centres participated.RESULTS: CXL is performed approximately 1300 times per year in these four Nordic countries with a population of around 21.7 million (2019). In most cases, progression is evaluated using the Pentacam HR, and the maximum keratometry reading (Kmax ) is considered the most important parameter. The most frequently used treatment protocol in Scandinavia is the 9 mW/cm2 epi-off protocol, using hydroxylpropyl methylcellulose riboflavin (HPMC-riboflavin). The participants deemed the following areas to be in most need of improvement: adaptation of the CXL protocol to individual patients (5/19), the development of effective epi-on treatment protocols (4/19), optimal performance of CXL in thin corneas (4/19), improvement of the definition of progression (2/19), and diagnosis of the need for re-treatment (2/19).CONCLUSIONS: We concluded that the diagnosis of progressive keratoconus and the diagnostic equipment used are similar. Treatment strategies are also similar but are suitably different to provide an interesting basis for the comparison of treatment outcomes. The high degree of participation in this survey indicates the possibility of future scientific collaboration on CXL focusing on the areas deemed to need improvement. It would also be of interest to evaluate the possibility of creating a Nordic CXL Registry. The high number of CXL treatments performed ensures sufficient statistical power to solve many questions. Such a registry could be an important contribution to evidence-based care and would allow for longitudinal evaluation.
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| 6. |
- Gustafsson, Ingemar, et al.
(författare)
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Early findings in a prospective randomised study on three cross-linking treatment protocols : Interruption of the iontophoresis treatment protocol
- 2023
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Ingår i: BMJ Open Ophthalmology. - 2397-3269. ; 8:1
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Tidskriftsartikel (refereegranskat)abstract
- Purpose To present the outcome of the interrupted iontophoresis-assisted treatment arm in an ongoing randomised clinical trial (NCT04427956). Methods A randomised clinical study of corneal cross-linking (CXL) using continuous UV-A irradiation at a rate of 9 mW/cm 2 and three different types of riboflavin and riboflavin delivery mode: (1) iso-osmolar dextran-based riboflavin (epithelium-off), (2) hypo-osmolar dextran-free riboflavin (epithelium-off) and (3) iontophoresis-assisted delivery of riboflavin (epithelium-on) for the treatment of progressive keratoconus. Inclusion criteria were an increase in the maximum keratometry value (Kmax) of 1.0 dioptre over 12 months or 0.5 dioptre over 6 months. The primary outcome in evaluating treatment efficacy was Kmax. Recently presented stratified detection limits were used post hoc to confirm the enrolment of patients with truly progressive keratoconus and in the assessment of the need for re-CXL. Results Thirteen patients had been randomised to iontophoresis-assisted CXL when the treatment arm was interrupted; two patients dropped out. Of the remaining 11 patients, 7 were deemed as having truly progressive disease according to the more recent stratified detection limits. The disease continued to progress in three patients according to the original definition (increase in Kmax≥1 D), necessitating re-CXL with epithelium-off CXL. This progression was confirmed by post hoc analysis using the stratified detection limits for progression. Conclusions The iontophoresis-assisted CXL protocol failed to halt further disease progression in 27% of the patients. The failure rate increased to 38% when considering only the patients deemed to have truly progressive disease using the stratified detection limits.
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| 7. |
- Gustafsson, Ingemar, et al.
(författare)
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Introducing a new tool for the assessment of progressive keratoconus: the Scandinavian Keratoconus Progression Application
- 2022
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Ingår i: Journal of EuCornea. - : EuCornea. - 2452-4034. ; 11:3, s. 1-9
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Tidskriftsartikel (refereegranskat)abstract
- PurposeTo develop an application for the Pentacam HR for the purpose of optimising the accuracy of the diagnosis of progressive keratoconus.MethodsMeasurements were performed on one randomised eye in twenty-five subjects with keratoconus Stage 1-2 according to the Amsler-Krumeich classification on two occasions, three days apart. Four replicate measurements were made by a single examiner on each occasion. The inter-day repeatability and detection limits for the diagnosis of progressive keratoconus were calculated for the following parameters: K2 and Kmax, and the parameters A, B and C from the Belin ABCD Progression Display. The measurements used as input are automatically extracted from the Pentacam HR database as comma-separated values. The application, developed in the R programming environment, provides a web browser-based user interface that presents these parameters both numerically and graphically.ResultsThe application includes detection limits for the diagnosis of progressive keratoconus obtained from two previous studies on the inter-day repeatability of measurements in subjects with keratoconus. The detection limits are based on inter-day repeatability, stratified according to disease severity, allowing the comparison of single measurements or a mean of four replicates.ConclusionsThis is the first application to provide an assessment of progressive keratoconus using detection limits based on inter-day repeatability. We believe this application will contribute to the more accurate diagnosis of progressive keratoconus. It also facilitates diagnosis and improves the clinical workflow as all the relevant information is presented numerically, graphically, and colour-coded in one interface.
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| 8. |
- Gustafsson, Ingemar, et al.
(författare)
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Patient experience and repeatability of measurements made with the Pentacam HR in patients with keratoconus
- 2023
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Ingår i: BMC Ophthalmology. - 1471-2415. ; 23:1, s. 201-201
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: To investigate whether the repeatability of measurements with the Pentacam HR in patients with keratoconus is improved by patients gaining more experience of the measurement situation. Such an improvement could enhance the accuracy with which progressive keratoconus can be detected. METHODS: Four replicate measurements were performed on Day 0 and on Day 3. Parameters commonly used in the diagnosis of progressive keratoconus were included in the analysis, namely the flattest central keratometry value (K1), the steepest central keratometry value (K2), the maximum keratometry value (Kmax), and the parameters A, B and C from the Belin ABCD Progression Display. In addition, quality parameters used by the Pentacam HR to assess the quality of the measurements were included, namely the analysed area (front + back), 3D (front + back), XY, Z, and eye movements. RESULTS: Neither the diagnostic parameters nor the quality parameters showed any statistically significant improvement on Day 3 compared to Day 0. The quality parameter "eye movements" deteriorated significantly with increasing Kmax. CONCLUSION: Gaining experience of the measurement situation did not increase the accuracy of the measurements. Further investigations should be performed to determine whether the increasing number of eye movements with increasing disease severity has a negative effect on the repeatability of the measurements.
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| 9. |
- Gustafsson, Ingemar
(författare)
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The assessment of disease progression in keratoconus and corneal crosslinking in thin corneae
- 2021
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Keratoconus generally manifests in adolescents, and can progress leading to severely impaired vision. The risk of progression is inversely correlated to age; thus younger patients are at higher risk than older ones. Progressive keratoconus can be halted by corneal crosslinking (CXL). The general indication for CXL is progressive keratoconus, although children are commonly treated with CXL upon diagnosis. Tomography is used to assess progression, and the most commonly used system is the Pentacam HR. Measurements made on different visits are compared to determine whether the patient’s keratoconus has progressed, and they should be referred for CXL. However, there is no consensus on which parameters should be used, or the change in magnitude of these parameters that indicates progression. An increase in the curvature power of the steepest point on the anterior surface, Kmax, of 1.0 dioptres is commonly used for all patients. However, there is little evidence that this is appropriate. Furthermore, inconsistent results have been presented regarding the magnitude at which progression can be detected. Such studies are often based on determinations of the repeatability of measurements made on one occasion. However, the progression of keratoconus is evaluated from measurements made on different occasions, and it is reasonable to assume that measurements obtained on different days will be subject to greater variation due to the biomechanical instability of corneae affected by keratoconus. Also, it has been suggested in studies that the repeatability of measurements in subjects with more severe keratoconus have poorer repeatability. Another important aspect of keratoconus is that it is a thinning disorder. A minimum corneal thickness of 400 µm has been suggested for the safe performance of CXL. Thus, a significant proportion of keratoconus patients will be excluded from the standard CXL treatment protocol.Thus, in the first study we elucidated the association between measurement error and disease severity. In the second investigation we investigated the inter-day repeatability and in the third investigation we investigated the Belin ABCD Progression Display. In the fourth study we investigate a protocol in which sterile water was added during the crosslinking procedure to increase the corneal thickness. The results demonstrated that the measurement error is associated to the disease severity and that limits at which progression is defined should be defined by inter-day measurements. The results also suggest that the diagnosis of progressive keratoconus by the Belin ABCD Progression Display will lead to overdiagnosis of progression. Further, the results suggest that the addition of sterile water is effective in increasing the corneal thickness above the suggested safety limits. These results have important clinical implications. The results demonstrate that limits at which progression is defined should be stratified according to the severity of the disease. Patients with less advanced keratoconus will be underdiagnosed as progressive if commonly used parameters are not stratified according to disease severity. This could lead to delayed referral for CXL, resulting in an avoidable risk of deterioration in vision. Patients with more advanced keratoconus, on the other hand, would be overdiagnosed as progressive, which could lead to unnecessary CXL, thus subjecting the patient to discomfort and possible treatment-associated complications. This risk of overdiagnosis of progression is also relevant when using the Belin ABCD Progression Display. Further, The data suggest that such a simple measure as adding sterile water during corneal crosslinking could enhance the corneal thickness above safety limits.
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| 10. |
- Gustafsson, Ingemar, et al.
(författare)
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The Interday Repeatability of Parameters for the Assessment of Progressive Disease in Subjects With Less Advanced Keratoconus
- 2021
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Ingår i: American Journal of Ophthalmology. - : Elsevier BV. - 0002-9394. ; 225, s. 38-46
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: To evaluate the interday repeatability in the measurement of parameters used for the detection of progression of keratoconus by prediction limits (PL) for single measurements, and the repeatability coefficient (RC) for the mean of replicate measurements. Design: Prospective reliability analysis for cases and control eyes. Methods: Twenty-five eyes in 25 subjects with KC and 25 eyes in 25 healthy controls were included. Four consecutive measurements were made, 3 days apart, with a Pentacam HR tomographic instrument (denoted the Pentacam) and a Nidek ARK 560-A auto-keratometer (denoted the keratometer). Main outcome measures were the intra- and interday RC of parameters used in the detection of progression of keratoconus. Results: The most repeatable parameter obtained with the Pentacam was the curvature power of the central flat meridian (K1, 0.44 D [RC], -0.55 to 0.60 diopter [D] [PL]), followed by the central steep meridian (K2, 0.72 D [RC], -0.90 to 0.94 D [PL]). The interday repeatability of K1 and K2 was similar when using the keratometer (K1, 0.32 D [RC], -0.66 to 0.57 D [PL], K2, 0.93 D [RC], -1.36 to 1.08 D [PL]). The interday repeatability of the curvature power of the steepest point (Kmax, 0.84 D [RC], -0.90 to 1.11 D [PL]) would benefit from being stratified: RC = 0.44 D and PL = -0.49 to 0.67 D for Kmax < 49.0 D, and RC = 1.08 D and PL = -1.19 to 1.42 D for Kmax ≥ 49.0 D. Conclusions: The interday repeatability of measurements, single or replicate, in subjects with keratoconus should be considered when diagnosing progressive disease. K1 exhibited the best intraday repeatability. Kmax benefits from being stratified according to disease severity.
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| 11. |
- Gustafsson, Ingemar, et al.
(författare)
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The intra- and inter-day repeatability of corneal densitometry measurements in subjects with keratoconus and in healthy controls
- 2023
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Ingår i: Scientific Reports. - 2045-2322. ; 13
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Tidskriftsartikel (refereegranskat)abstract
- The healthy cornea is transparent, however, disease can affect its structure, rendering it more or less opaque. The ability to assess the clarity of the cornea objectively could thus be of considerable interest for keratoconus patients. It has previously been suggested that densitometry can be used to diagnose early keratoconus, and that the values of densitometry variables increase with increasing disease severity, indicating that densitometry could also be used to assess progressive keratoconus. Previous studies have only assessed the repeatability of corneal densitometry measurements on the same day, which does not reflect the clinical setting in which changes are evaluated over time. We have therefore evaluated the inter-day repeatability of densitometry measurements in both patients with keratoconus and healthy controls. Measurements in the middle layer of the 2-6 mm zone of the cornea showed the best repeatability. Although an objective measure of the corneal transparency could be interesting, the generally poor repeatability of densitometry measurements limits their use. The repeatability of corneal clarity measurements could be improved by using other approaches such as optical coherence tomography, but this remains to be investigated. Such improvements would allow the more widespread use of corneal densitometry in clinical practice.
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| 12. |
- Ning, Rui, et al.
(författare)
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Assessing progression limits in different grades of keratoconus from a novel perspective : precision of measurements of the corneal epithelium
- 2024
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Ingår i: Eye and Vision. - 2326-0254. ; 11:1
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Tidskriftsartikel (refereegranskat)abstract
- Background: To assess repeatability and reproducibility of corneal epithelium thickness (ET) measured by a spectral-domain optical coherence tomographer (SD-OCT)/Placido topographer (MS-39, CSO, Florence, Italy) in keratoconus (KC) population at different stages, as well as to determine the progression limits for evaluating KC progression. Methods: A total of 149 eyes were enrolled in this study, with 29 eyes in the forme fruste keratoconus (FFKC) group, 34 eyes in the mild KC group, 40 eyes in the moderate KC group, and 46 eyes in the severe KC group. Employing the within-subject standard deviation (Sw), test-retest variability (TRT), coefficient of variation (CoV), and intraclass correlation coefficient (ICC) to evaluate intraoperator repeatability and interoperator reproducibility. Results: The repeatability and reproducibility of MS-39 in patients with KC were acceptable, according to ICC values ranging from 0.732 to 0.954. However, patients with more severe KC and progressive peripheralization of the measurement points had higher TRTs but a thinning trend. The current study tended to set the cut-off values of mild KC, moderate KC, and severe KC to 4.9 µm, 5.2 µm, and 7.4 µm for thinnest epithelium thickness (TET). When differences between follow-ups are higher than those values, progression of the disease is possible. As for center epithelium thickness (CET), cut-off values for mild KC, moderate KC, and severe KC should be 2.8 µm, 4.4 µm, and 5.3 µm. This might be useful in the follow-up and diagnosis of keratoconus. Conclusions: This study demonstrated that the precision of MS-39 was reduced in measuring more severe KC patients and more peripheral corneal points. In determining disease progression, values should be differentiated between disease-related real changes and measurement inaccuracies. Due to the large difference in ET measured by MS-39 between various stages of disease progression, it is necessary to accurately grade KC patients to avoid errors in KC clinical decision-making.
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| 13. |
- Nyman-Carlsson, Erika, 1982-
(författare)
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Anorexia nervosa - The journey towards recovery : A randomized controlled treatment trial: assessment, prediction, treatment outcome and clinical change
- 2021
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The overall aim of this thesis was to study young adult women with anorexia nervosa (AN) participating in an randomized controlled trial in relation to assessment, treatment outcome, prediction, and clinical change. The results confirm the Eating Disorder Inventory-3 as a valid instrument for measuring eating disorder symptoms and general psychopathology. AN patients, however, rate themselves significantly lower than patients with other eating disorder diagnoses, and interoceptive deficits are the best predictive subscale for AN diagnosis. Patients significantly improved in terms of weight and eating disorder psychopathology, with no differences between individual CBT and family therapy (FT). Most patients did not fulfill the diagnostic criteria at post-assessment, at 76% and 86% at followup. Patients in FT were considered completers to a higher extent than patients receiving CBT, and 8% were prematurely discharged, in comparison to 30% for CBT. Bulimic symptoms and emotional dysregulation at baseline had a negative effect on diagnostic symptoms, and lower levels of interoceptive deficits predicted weight increase in the FT group. Lower levels of emotional dysregulation and higher levels of interoceptive deficits explained 37% of the variance in BMI changes in the CBT group. The classifications of CS/RCI were shown to be valid when compared to normal controls. Patients classified as clinically significantly improved constituted 35-47% of all patients, and only three patients fulfilled the proposed definition of recovery. The agreement of the diagnostic criteria was fair.The results suggest that individual CBT and FT are effective treatments for young adults. The ability to acknowledge, interpret, and handle emotions is an important aspect of treatment. Self-report measurements are useful for evaluating individual changes; however, diagnostic criteria do not accord with self-reported symptom changes and physical, behavioral, and psychological measurements are important for a complete estimation of recovery.
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| 14. |
- Nyman-Carlsson, Erika, 1982-, et al.
(författare)
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Individual cognitive behavioral therapy and combined family/individual therapy for young adults with Anorexia nervosa : A randomized controlled trial
- 2020
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Ingår i: Psychotherapy Research. - : Routledge. - 1050-3307 .- 1468-4381. ; 30:8, s. 1011-1025
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: In this study, we evaluate the efficacy of outpatient individual cognitive behavioral therapy for young adults (CBT-YA) and combined family/individual therapy for young adults (FT-YA) for anorexia nervosa (AN).METHOD: Participants (aged 17-24 years) with AN in Sweden were recruited and assigned to 18 months of CBT-YA or FT-YA. Treatment efficacy was assessed primarily using BMI, presence of diagnosis, and degree of eating-related psychopathology at post-treatment and follow-up. Secondary outcomes included depression and general psychological psychopathology. The trial was registered at http://www.isrctn.com/, ISRCTN (25181390).RESULTS: Seventy-eight participants were randomized, and seventy-four of them received allocated treatment and provided complete data. Clinical outcomes from within groups resulted in significant improvements for both groups. BMI increased from baseline (CBT-YA 16.49; FT-YA 16.54) to post-treatment (CBT-YA 19.61; FT-YA 19.33) with high effect sizes. The rate of weight restoration was 64.9% in the CBT-YA group and 83.8% in the FT-YA group. The rate of recovery was 76% in both groups at post-treatment, and at follow-up, 89% and 81% had recovered in the CBT-YA and FT-YA groups respectively.CONCLUSIONS: Outpatient CBT-YA and FT-YA appear to be of benefit to young adults with AN in terms of weight restoration and reduced eating disorder and general psychopathology.
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| 15. |
- Wang, Yiran, et al.
(författare)
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Repeatability of Epithelium Thickness Measured by an AS-OCT in Different Grades of Keratoconus and Compared to AS-OCT/Placido Topography
- 2024
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Ingår i: American Journal of Ophthalmology. - 0002-9394. ; 265, s. 213-223
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: To compare agreement of corneal epithelium thickness (ET) between AS-OCT system (RTVue, Optovue) and AS-OCT/Placido topographer (MS-39, CSO) in eyes with different stages of keratoconus (KC), and to assess the repeatability of RTVue AS-OCT. DESIGN: Prospective reliability analysis. METHODS: KC eyes were classified into forme fruste KC (FFKC), mild, moderate, and severe KC. Agreement was evaluated with Bland–Altman plots and 95% limits of agreement (LoA). The repeatability of RTVue was assessed via within-subject standard deviation (Sw), test–retest variability (TRT), coefficient of variation (CoV), and intraclass correlation coefficient (ICC). RESULTS: A total of 119 KC eyes were enrolled, with 21 being FFKC, 26 mild, 39 moderate, and 34 severe. The 95% LoA ranged between −5.9 and 4.8 µm for center epithelium thickness (CET), between −5.7 and 8.2 µm for thinnest epithelium thickness (TET). At 1-mm measuring points, the 95% LoA of superior, inferior, nasal, and temporal were −4.2 to 4.7 µm, −5.2 to 6.0 µm, −7.9 to 10.2 µm, and −11.2 to 6.0 µm. At 3-mm measuring points, the corresponding values were −2.8 to 9.3 µm, −2.0 to 13.0 µm, −4.6 to 9.6 µm, and −6.3 to 9.7 µm, indicating that the 2 instruments were not interchangeable without adjustment. Despite that the repeatability of RTVue measurements in KC patients were acceptable, repeatability decreased gradually with the peripheralization of the measurement points. CONCLUSIONS: The 2 OCT-based devices, RTVue and MS-39, do not provide interchangeable measurements of epithelium thickness in KC patients. Repeatability decreases in cases of more severe KC, emphasizing the importance of grading before clinical examination to avoid diagnostic errors.
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