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Session Title: Quality of vision evaluation techniques
Session Date/Time: Tuesday 08/10/2013 | 14:00-16:00
Paper Time: 14:06
Venue: Elicium 2 (First Floor)
First Author: : M.Van der Mooren THE NETHERLANDS
Co Author(s): : D. Meikies R. Guthoff O. Stachs
The aim of this study is to propose a new method of measuring disability glare
University of Rostock, Germany
The Rostock Glare Perimeter (RGP) consists of projection screen with a central cold light source with fiber optics of 2 mm diameter. The subject gazes at this light source resulting in an illuminance of 0.65 lux at the level of the eye. A white, square marker with an angular size of 0.09 degrees and a luminance of 22 cd/m² is stepwise moving outward from the center at a speed of 0.25 degrees per second. In a random sequence, this spot moved sequentially in one of a total of 12 directions. Sixty phakic subjects of different age were dazzled by a bright light source centered at a projection screen 3.30 m away from the subject`s eye. The area where the subject cannot distinguish the white marker from the glare effects of the light source was determined. A corresponding mean radius in terms of a field angle relative to the subjects eye was defined as a measure for disability glare (DG). Monocular and binocular measurements were performed. A precision study was performed to determine the within-operator and inter-operator limits of the RGP.
A significant mean positive correlation of DG with age (r=0.534, p<0.001) was found. The DG ranged from 0.33 to 1.85 degrees, and a strong (r=0.93, p<0.0002) binocular summation effect was found. The binocular summation factor for DG is larger than pure optical summation and of the same magnitude as found in other studies when investigating binocular summation for visual acuity and contrast sensitivity. The within-operator and inter-operator limit of the RGP method is 0.13 degrees and 0.05 degrees for 95% confidence intervals, respectively.
The RGP is sensitive to detect age-related DG differences. The binocular summation effect found for DG in a healthy population indicates a neural cause for DG suppression. These findings suggest that the RGP is a helpful device to quantify symptoms of glare.
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