On the use of small artificial pupils to open-loop the accommodation system.
Monocular accommodation responses to stimuli at vergences from 0 to -4.5 D (i.e. effective object-eye distances from infinity to 22 cm) were measured objectively using artificial pupils of 0.5, 0.75, 1.0 and 3.0 mm diameters and a constant retinal illuminance of 7000 td. The slopes of the response/stimulus curves for the 0.75, 1.0 and 3.0 mm pupils agree with those reported previously. The 0.5 mm pupil produced open-loop accommodation, no systematic change in accommodation being observed as the stimulus vergence was varied. However, the response drifted considerably with this pupil diameter.
Ward
P A
PA
Department of Ophthalmic Optics, University of Manchester Institute of Science and Technology, U.K.
Charman
W N
WN
D000065:Accommodation, Ocular; D006801:Humans; D008722:Methods; D011680:Pupil / Q000502:physiology*