Simulating the straylight effects of cataracts

Wit, Gerard C. de; Franssen, Luuk; Coppens, Joris E.; Berg, Thomas

doi:10.1016/j.jcrs.2006.01.048

Cited by 87 publications

(106 citation statements)

References 19 publications

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“…They differ in the particle number, and consequently, in the scattering effect. It has been shown that straylight-angular dependence of the BPM filters agrees well with that of the human eye [18].…”

Section: Validation Testmentioning

confidence: 58%

Validation of a spectral light scattering method to differentiate large from small particles in intraocular lenses

Łabuz

Papadatou

Vargas-Martı́n

et al. 2017

Biomed. Opt. Express

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Abstract:A psychophysical approach has been designed to measure straylight from intraocular lenses (IOLs) in vitro. This approach uses a clinical straylight meter (C-Quant) and an observer's eye as optical detector. Based on this, we introduced a method for study of straylight-wavelength dependency for IOLs. This dependency can be used to distinguish between 2 types of scattering particles (small and large) as defined by Mie theory. Validation was performed using a turbidity standard and scattering filters. Several IOLs were analyzed to identify potential scattering sources. Large particles were found to predominate in scattering from the studied lenses. This was confirmed by straylight-angular dependency found in these IOLs.

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Section: Validation Testmentioning

confidence: 58%

Validation of a spectral light scattering method to differentiate large from small particles in intraocular lenses

Łabuz

Papadatou

Vargas-Martı́n

et al. 2017

Biomed. Opt. Express

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“…The amount of retinal stray light is different for each individual and in the young, normal eye is roughly caused onethird by the cornea (increased by corneal dystrophies), 83 one-third by the lens (increased by cataracts), 84,85 and one-third by the iris, sclera and fundus (sensitive to changes in pigmentation and vitreous turbidity). 86 The stray light naturally increases with age due to increasing media opacification.…”

Section: Retinal Stray Lightmentioning

confidence: 99%

Visual and optical performance with hybrid multifocal intraocular lenses

Madrid-Costa

Cerviño

Ferrer-Blasco

et al. 2010

Clinical and Experimental Optometry

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During the past years, the wish to become independent of spectacles has been growing among cataract and presbyopic patients due to many factors, such as the increase in near visual demands, the aesthetic need for a spectacle-free image and ageing of refractive surgery patients, among others. This review assesses recently published studies that analyse visual and optical performance through different metrics of eyes implanted with multifocal intraocular lenses (IOLs), particularly hybrid IOL designs. The published evidence suggests that hybrid multifocal IOLs provide very good outcomes in a number of visual and optical performance parameters. Patients implanted with this type of IOL obtain a satisfactory full range of visual functions, including patients of particular characteristics such as highly ametropic or post-LASIK.

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“…The increased opalescence of the lens with cataract development results in increased forward light scatter [21] that produces a veiling Abstract Purpose: The CVA is an interactive, automated computer device that rapidly thresholds central acuity under conditions mimicking customary photopic and mesopic activities. In sequence, the CVA may test up to 6 environments, in this series under 3 mesopic environments (98%, 50% MC against 1.6 cd/m 2 background, 25% MC against 5 cd/m 2 ), then 3 glare environments (98%, 10% and 8% MC, against 200 cd/m 2 ).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, whereas the pupil diameter of a healthy 20-year-old on average is 5.3 mm in dim illumination, the pupil of a 60-year-old typically has a diameter of 3.2 mm [20] resulting in one third of the retinal illumination in dim environments. Contrast sensitivity testing has been demonstrated to remain stable until the age of approximately 65 years beyond which it and overall visual function decline rapidly [12,19], thought primarily due to senile miosis and progressive nuclear sclerosis, as well as with the aging of neural elements, both retinal and brain [20].The increased opalescence of the lens with cataract development results in increased forward light scatter [21] that produces a veiling Abstract Purpose: The CVA is an interactive, automated computer device that rapidly thresholds central acuity under conditions mimicking customary photopic and mesopic activities. In sequence, the CVA may test up to 6 environments, in this series under 3 mesopic environments (98%, 50% MC against 1.6 cd/m 2 background, 25% MC against 5 cd/m 2 ), then 3 glare environments (98%, 10% and 8% MC, against 200 cd/m 2 ).…”

mentioning

confidence: 99%

“…Although cataracts have been grouped and graded according to opacification categories [2], no correlation has been observed between glare sensitivity demonstrated by a number of devices and the backscatter opacification assessed by the type or grade of cataract [21][22][23][24]. However, a weak relation has been noted by some investigators [21,22] between cataract grading and high contrast chart visual acuity that may be due to alterations in refraction.Straylight, produced by optical media scattering, produces the greatest impairment of vision when glare sources are of 1° to 90° from fixation. The light scattering has been termed disability glare since it causes a veiling luminance over the whole retina that adds to the retinal projection of the visual scene, thereby reducing the contrast of the discriminated components of the image.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Computer Measurement of Central Visual Acuity under Mesopic and Glare Conditions in Eyes with Nuclear Cataract

Gutstein¹,

Sinclair²,

Presti³

et al. 2015

J Comput Sci Syst Biol

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BackgroundCataract lens opacification and color changes, occurring with age [1,2] and with systemic or ocular disease [3][4][5], world-wide have become the most common cause of visual complaints, primarily of glare and reduced contrast for multiple tasks in bright as well as dim light. Central visual acuity (VA), as measured by high contrast charts, has been demonstrated to be a poor determinant of visual function as well as patient complaints in eyes with significant cataract changes [6]. Patients having a cataract may demonstrate good visual acuity, whereas the contrast sensitivity testing demonstrates impairment even at early stages of the cataract development [3][4][5][7][8][9], especially when the eye is tested with off-axis glare. Bailey [10] and Lasa et al. [5] tested patients with cataracts using the Pelli-Robson and Vistech contrast sensitivity charts and reported that while both appear to evaluate visual function in moderate to advance cataracts, for early cataracts they and others [11] suggested that other techniques need to be developed including methods that utilize different luminance environments and off-axis glare elements in order to understand the range of visual disability under the varying environment conditions commonly presented during day and evening activities.As the lens ages there is a linear increase in lens opalescence and absorption of light, especially for blue light [12][13][14][15][16]. The increased absorption by the lens reduces retinal illumination and the opalescence increases diffraction and forward scatter, causing reductions in contrast sensitivity and colour discrimination [17]. A loss of contrast sensitivity has been observed with brunescence or opalescence of the lens causing loss primarily in the middle and high spatial frequencies [12]. This causes greater difficulty in vision under unfavourable lighting conditions especially at dusk where older individuals require higher contrasts to recognize and differentiate objects [10,18,19]. In addition, whereas the pupil diameter of a healthy 20-year-old on average is 5.3 mm in dim illumination, the pupil of a 60-year-old typically has a diameter of 3.2 mm [20] resulting in one third of the retinal illumination in dim environments. Contrast sensitivity testing has been demonstrated to remain stable until the age of approximately 65 years beyond which it and overall visual function decline rapidly [12,19], thought primarily due to senile miosis and progressive nuclear sclerosis, as well as with the aging of neural elements, both retinal and brain [20].The increased opalescence of the lens with cataract development results in increased forward light scatter [21] that produces a veiling Abstract Purpose: The CVA is an interactive, automated computer device that rapidly thresholds central acuity under conditions mimicking customary photopic and mesopic activities. In sequence, the CVA may test up to 6 environments, in this series under 3 mesopic environments (98%, 50% MC against 1.6 cd/m 2 background, 25% MC against 5 cd/m 2 ), the...

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Simulating the straylight effects of cataracts

Abstract: The BPM 2 filter is a good early-cataract-simulating filter. Stacking such filters is a good way to increase the cataract density. A drawback is that the BPM 2 filter has a transmission of 66% so stacking filters reduces the overall transmission significantly.

Cited by 87 publications

References 19 publications

Validation of a spectral light scattering method to differentiate large from small particles in intraocular lenses

Validation of a spectral light scattering method to differentiate large from small particles in intraocular lenses

Visual and optical performance with hybrid multifocal intraocular lenses

Computer Measurement of Central Visual Acuity under Mesopic and Glare Conditions in Eyes with Nuclear Cataract

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