| 1. |
- Hanner, P, et al.
(författare)
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Clinical observations of effects on central nervous system in patients with acute facial palsy.
- 1987
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Ingår i: Archives of otolaryngology--head & neck surgery. - 0886-4470. ; 113:5, s. 516-20
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Tidskriftsartikel (refereegranskat)abstract
- Twenty-eight consecutive patients with acute unilateral facial palsy were examined with special reference to clinical signs of central nervous system involvement. The clinical investigation in the acute stage of the disease showed that only seven patients had solitary facial nerve dysfunction, while the remaining patients had evidence of more widespread disease involvement. The most frequent finding was a trigeminal dysfunction of the paretic side, as shown by paresthesia and sensibility disturbance corresponding to the sensoritrigeminal area, as well as a dysfunction of the trigeminal component of the corneal reflex of the paretic side. Three patients showed migrating symptoms that were suggestive of a brain-stem disorder. In addition, four patients had an optic neuropathy, while an abnormal brain-stem audiometry response was demonstrated in five patients. The outcome of acute facial palsy one to two years after onset, however, could not be predicted from the clinical central nervous system signs. The degree of the palsy in the acute stage of the disease still seemed to be one of the most important prognostic factors. It is concluded that acute facial palsy is not a single entity, but rather a feature of different neurologic conditions.
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| 2. |
- Hallengren, Bengt, et al.
(författare)
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Normal visual fields as assessed by computerized static threshold perimetry in patients with untreated primary hypothyroidism
- 1989
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Ingår i: Acta Endocrinologica. - 0001-5598. ; 121:4, s. 495-500
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Tidskriftsartikel (refereegranskat)abstract
- In this prospective study, 25 consecutive patients with untreated primary hypothyroidism were tested with a highly sensitive perimetric technique, since a high prevalence of visual field defects has been described in this condition. All patients had clinical hypothyroidism, a serum TSH value greater than 20 mU/l (reference range 0.4-4.0) and decreased/low normal serum total T4 concentration. Visual fields were tested with fully automated threshold-measuring computerized perimetry of the central 30 degrees field. Interpretation of fields included computer-assisted analysis provided by a perimetric statistical programme package. In 23 patients, conventional inspection and computer-assisted analysis showed no visual field defects. Two patients were excluded from the latter analysis: one patient who did not respond adequately at computerized perimetry and in whom manual field tests were entirely normal: one patient who had low sensitivity values in the uppermost parts of both visual fields owing to markedly swollen upper eye lids. In conclusion, although pituitary hyperplasia has been well documented in primary hypothyroidism, the present prospective study clearly indicates that visual field defects are not a common finding in patients with this disease.
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| 3. |
- Frisén, Lars, 1939
(författare)
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Acuity perimetry: estimation of neural channels.
- 1988
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Ingår i: International ophthalmology. - 0165-5701. ; 12:3, s. 169-74
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Tidskriftsartikel (refereegranskat)abstract
- Measurements of peripheral visual acuity allow quantitative estimations of retino-cortical neural channels. Analysis of results from high-pass resolution perimetry revealed that about 2/3 of all channels are contained within 30 degrees of visual field eccentricity and that loss of 1/3 raises the average threshold level about 1 decibel. The analytical procedure can be applied to any type of visual field defect.
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| 4. |
- Frisén, Lars, 1939, et al.
(författare)
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Binocular summation in humans: evidence for a hierarchic model.
- 1988
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Ingår i: The Journal of physiology. - 0022-3751. ; 402, s. 773-82
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Tidskriftsartikel (refereegranskat)abstract
- 1. Binocular summation was studied in human subjects using a batter of vision tests. Two tests assessed detection, another three acuity, one hyperacuity and one pattern recognition. 2. The magnitude of summation was consistent with, or exceeded, the level predicted from quadratic summation for both detection tests. 3. The summation factor was significantly smaller in the resolution tests than in the detection tests. Hyperacuity showed a large individual variation. 4. Spatial filtering of acuity targets did not influence summation. 5. No summation was found in the pattern recognition test. 6. It is argued that the degree of summation is related to the complexity of the visual task. A simple task yields a larger binocular summation than a more complex one. This may be related to the level of processing in the primary visual cortex.
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| 5. |
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| 6. |
- Frisén, Lars, 1939
(författare)
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Computerized perimetry: possibilities for individual adaptation and feedback.
- 1988
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Ingår i: Documenta ophthalmologica. Advances in ophthalmology. - 0012-4486. ; 69:1, s. 3-9
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Tidskriftsartikel (refereegranskat)abstract
- Computerized perimetry is often poorly accepted by the tested subjects, presumably because of sparse feedback and lack of adaptation to individual capacity. Several remedies are suggested, including visual response feedback, active correction of erroneous responses, various fixation prompts, and continuous adaptation to current reaction time. Intuitively intelligible result displays are also desirable. A novel format representing threshold level by symbol size may meet this need.
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| 7. |
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| 8. |
- Frisén, Lars, 1939, et al.
(författare)
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Episodic astigmatism heralding generalized myopathy: report of a case managed with a new type of soft contact lens.
- 1984
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Ingår i: Ophthalmology. - 0161-6420. ; 91:2, s. 179-82
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Tidskriftsartikel (refereegranskat)abstract
- A 29-year-old woman presented with marked variations in refraction. A few minutes of physical exertion or reading at a close distance induced up to 2D of myopia and 2D of myopic astigmatism, which regressed upon resting with closed eyes. Cycloplegic agents did not affect the refractive changes, which were shown to be due to variations in corneal curvatures. The eyes were otherwise clinically normal. A few months later the patient developed signs of a progressive, generalized myopathy of unknown origin. The muscular disease was resistant to treatment. The refractive changes were effectively controlled by means of a new type of soft contact lens, with a semi-rigid center.
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| 9. |
- Frisén, Lars, 1939
(författare)
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Fundus changes in acute malnutritional optic neuropathy.
- 1983
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Ingår i: Archives of ophthalmology (Chicago, Ill. : 1960). - 0003-9950. ; 101:4, s. 577-9
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Tidskriftsartikel (refereegranskat)abstract
- A peculiar dilation and tortuosity of small retinal vessels within the arcuate areas of the retinal nerve fiber layer occurred in a series of patients with acute malnutritional optic neuropathy ("tobacco-alcohol amblyopia"). These evanescent vascular abnormalities may be caused by arteriovenous shunting. They seem to be specific indicators of the early phase of this disease.
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| 10. |
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