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Effect of target contrast and luminance on soft contact lens and spectacle visual performance
M Guillon1, D P Lydon, R T Solman
1Cornea and Contact Lens Research Unit, School of Optometry, University of New South Wales, Kensington, Australia.
Abstract:
The visual performance of four soft contact lenses was investigated using visual acuity charts at six contrast levels (from 90 to 8%) under normal (250cd/m2) and reduced 92.5cd/m2) luminances. This investigation reveals significant differences not detected by conventional visual acuity measurements; in general, reducing luminance or contrast increases the magnitude of any recorded difference. Furthermore, the study pointed to a significantly poorer visual performance with spectacles compared to standard thickness soft contact lenses under low luminance and contrast conditions. Finally, a recommended examination routine is described.