Maximum disparity with acuvue bifocal contact lenses with changes in illumination.
OBJECTIVE
To assess the visual performance of Acuvue bifocal contact lenses at different illumination levels using a stereoscopic parameter, the maximum disparity. We compare the results with those for progressive spectacle lenses.


METHODS
We used a modified Wheatstone stereoscope and random-dot stereograms (RDS) as tests. The maximum disparity was measured for each observer at different luminance levels.


RESULTS
Maximum disparities did not show statistically significant differences for a wide range of luminance levels with contact lenses. The maximum disparities found when some contact-lens users wore progressive spectacle lenses were similar.


CONCLUSIONS
The results show that the Acuvue bifocal lenses offer good performance for a near visual task, in this case the maximum disparity, for changes in illumination and are similar to that with progressive spectacle lenses.
Jiménez
J R
JR
Departamento de Optica, Facultad de Ciencias, Universidad de Granada, Spain. jrjimene@ugr.es
Durban
J J
JJ
Anera
R G
RG
D000328:Adult; D003261:Contact Lenses; D003867:Depth Perception; D004215:Distance Perception; D004867:Equipment Design; D005139:Eyeglasses; D006801:Humans; D008029:Lighting; D008875:Middle Aged; D055095:Optics and Photonics; D010775:Photic Stimulation / Q000379:methods*