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The role of cataract features and pupil size in intraocular straylight and the effects on vision-related quality of life

Poster Details

First Author: Jong THE NETHERLANDS

Co Author(s):    I. van der Meulen   T. van den Berg                 

Abstract Details


To examine the effect of lens opacity type and location on straylight in the normal and dilated pupil in patients with cataract.


Prospective study conducted at the ophthalmology department of the Amsterdam University Medical Center.


Intraocular straylight will be measured using the Oculus C-Quant device which uses the psychophysical compensation comparison method giving a numeric value of forward lightscatter as experienced by the patient. Cataract and lens opacities were graded using LOCS III and forward and retrograde slitlamp photographs.


Measurements were performed on 16 eyes in 13 patients. Average pupil size before mydriatic use was 3.3mm, increasing to 6.9mm after mydriatic use. Single type cataract was defined as LOCS III score 3 or higher in a single LOCS category. Nuclear cataract average straylight decreased from 1.89 to 1.66 log(s) after mydriasis. Cortical cataract average straylight increased from 1.45 to 1.63 log(s) after mydriasis. Posterior subcapsular cataract showed variable change depending on location and size.


Lens opacity location influences straylight depending on pupil size. Central opacities show a decrease in straylight in the dilated pupil, whereas peripheral opacities increase straylight in dilated pupils. This can affect quality of vision depending on patient lifestyle such as participating in night time driving, aiding in cataract surgery decision making.

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