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Straylight in fish eye disease

Poster Details

First Author: I.van der Meulen THE NETHERLANDS

Co Author(s):    S. van de Wouw   R. Lapid-Gortzak   C. Nieuwendaal   T. van den Berg           

Abstract Details


1) To quantify visual complaints in patients with fish eye disease (FED) with good visual acuity by examining straylight values and 2) to test the angular dependency of straylight in FED.


Academic Medical Center, Amsterdam, The Netherlands


Straylight was measured in a 65-year-old patient, a 53-year-old patient, and a 36-year-old patient with FED with the compensation comparison method (Oculus C-Quant). Only the left eye was included for the second patient, due to complications of the right eye. Patients 1 and 3 also performed the direct comparison method to measure straylight at different visual angles. Other tests included slitlamp examination and visual acuity measurement.


Mean straylight of all patients was strongly elevated: of patient 1 >13x, of patient 2 24 x and of patient 3 >7x compared to normal age-related values. VA was close to normal (LogMar of patient 1: 0.04 and 0.06, patient 2: 0.15, patient 3: 0.00 and 0.02). A timeline of multiple straylight measurements of patient 1 shows a slow increase of straylight, consistent with the progressive nature of FED. Straylight in FED is not strongly dependent on angle, as is also found in other important types of straylight defects, such as cataract and corneal haze.


Straylight in patients with FED follows relatively normal angular dependence. The patients in this study had highly elevated straylight, despite maintaining nearly normal visual acuity. Thus, visual acuity measurements are less suitable to evaluate the complaints in patients with FED. Straylight measurements can support clinical decision-making by quantifying complaints about reduced visual quality, even if visual acuity remains normal. For cataract logMAR log(s) = 1.5 has been proposed as indication value to consider surgery, but for corneal transplantation a higher limit value seems more likely, as corneal transplantation is a more challenging procedure.

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