School of Optometry and Vision Science

The study aims to compare the ability of the Freiburg Acuity and Contrast Test (FrACT) and Berkeley Rudimentary Vision Test (BRVT) to quantify visual acuity (VA) in patients who score non-numerical VA using standard charts and in artificially degraded subjects.

This study aims to assess the effect of room illumination and chart luminance on visual acuity and contrast sensitivity. Results from the study will provide an evidence-based recommendation on luminance and illumination levels that produce valid, repeatable, and reliable visual acuity measures, as well as serve as a basis for further studies to determine the effect of light on other measured visual parameters.

The notion that different diseases differ in their optical effect will be simulated in the present study through the use of different types of artificial stimulus degradation, in particular dioptric and gaussian blur. With gaussian blur, VEP acuity, psychophysical grating acuity, and psychophysical Landolt C acuity is expected to show better agreement than with dioptric blur. With the latter, VEP acuity and psychophysical grating acuity is expected to deviate from psychophysical Landolt C acuity.