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- Abrahamsson, Maths, 1953, et al.
(författare)
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[Dim the light! Glare problems in a world with ever increasing demands on visual acuity] : Blända av!
- 1997
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Ingår i: Läkartidningen. - 0023-7205. ; 94:41, s. 3607-11
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Ocular tissue transparency is dependent on the regular lattice configuration of lens and corneal fibres of uniform diameter. Ageing is associated with degeneration of both lens and cornea, which lose some of their structural order and eventually their transparency, though this process is not uniform. The structural changes are local and result in ocular media opacities. When the opacities increase in number and extension, they begin to affect visual acuity. As the loss of acuity becomes clinically significant, we speak of clinically relevant cataract. Retinal exposure to light diffused by intraocular light scattering induces optical glare, one of two forms of glare. The other form is transient glare--i.e., glare due to adaptation problems in an environment with rapidly changing ambient luminance. Contemporary society is characterised by increasing emphasis on visual information in such forms as texts, icons, signs and symbols. The computer revolution has been accompanied by further stress on the importance of the detection and interpretation of written instructions.
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| 3. |
- Billger, Monica, 1961, et al.
(författare)
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An assessment method for evaluating colour rendering properties of light sources
- 2015
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Ingår i: Proceedings of the 28th Session of the CIE, Manchester, United Kingdom, 28 June – 4 July 2015. - 9783902842558 ; Volume 1:part 2, s. 954-963
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Konferensbidrag (refereegranskat)abstract
- Abstract We present an assessment method to evaluate how the spectral power distribution of light influences the perception of colours and small colour differences. Included in the method are several ways to measure properties of reflected light with a spectroradiometer, visual assessments of perceived colours, and a visual performance test that aims at identifying an individual minimum colour contrast visibility threshold. In a first application of the assessment method, we used a colour contrast test chart printed on paper and studied it under the illumination of three LED light sources, halogen light and daylight. We concluded that the visual performance test was effective for reviling visibility thresholds for colour contrasts and that the method has potential for understanding the influence of spectral power distribution on perceived colour and visual performance. The methodology can be useful for optimizing illumination for individual needs.
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| 7. |
- Jonsson, Kenneth, et al.
(författare)
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Traffic compensated luminance estimation
- 2015
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Active control of street light sources based on sensor data is desired to meet requirements on traffic safety and environmental protection. In this report, we summarise the results of a research study focusing on some of the fundamental problems occurring when performing real-world sensor measurements for lighting control. In particular, we present results on the impact of traffic and the relationship between sensor angle and measured road surface luminance. Moreover, we present a comparison between different approaches to estimating the veiling luminance in tunnel lighting applications.
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| 8. |
- Knutsson, Per, 1978, et al.
(författare)
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Correction of static and non-common path aberrations in an adaptive optics system using inherent calibration data
- 2021
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Ingår i: Optics Express. - : Optica Publishing Group. - 1094-4087. ; 29:3, s. 3406-3414
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Tidskriftsartikel (refereegranskat)abstract
- For low-order adaptive optics systems, a method that is able to correct for system aberrations in the final focal plane is presented. The paper presents a novel figure of merit, corresponding to the integrated non-normalized tip-tilt-free optical transfer function. The inherent singular value decomposition modal content of the interaction matrix is used to optimize this figure of merit. The method has proven to be stable and robust, providing a simple mean to facilitate diffraction limited imaging in an experimental setup for ophthalmic applications. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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| 9. |
- Lindgren, Mikael, 1963, et al.
(författare)
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Traffic compensated luminance estimation
- 2015
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Ingår i: 28th CIE Session, 28 jun - 4 jul 2015 Manchester UK.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 10. |
- Löfgren, Stefan, et al.
(författare)
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Laser pointers and Eye injuries. An analysis of reported cases
- 2013
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- The safety limits that exist for human exposure of laser radiation are essential to reduce the risk of injuries. These values, however, give very little information on what tissue damages that may be expected at various elevated exposure levels. Similarly, the Swedish Radiation Protection Authority (SSM) has very little information on how such tissue damage is related to the impairment of the vision. This type of relationship between an imaginary exposure and a subsequent disability is very useful in the risk assessments that are made in the authority’s supervision activities. Also, the damage’s evolvement over time is information that the authority can make use of in risk assessments. The purpose of this study was to investigate what dose of laser radiation, in terms of intensity and exposure time, may be associated with eye damages. The study has been limited to unwanted exposures of laser radiation from commercially available laser pointers. Of particular interest has been to search for data that clarify the dose-response relationships for functional disabilities that persist more than 6 months. The study shows that long-term vision loss can occur as a result of involuntary exposure from commercially available (strong) laser pointers at close range. The injury may occur before a normal person is able to respond by closing the eyelid, although there are only a few cases reported. A minor such damage is transient within a few days. It is also likely that such a visible injury to the retina becomes functional, i.e. prevents reading skills. What dosage is required for the disability to become permanent is not clear in the literature. Also, the dynamics of evolvement and repair of tissue damages and disabilities are hardly described at all.
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