The effect of spatial frequency on steady-state accommodation.
Accommodation responses to sinusoidally modulated vertical gratings, at a vergence of -5.0 D, were measured over a 10 min period. Three spatial frequencies were employed: 1.67, 5.0 and 15 cycles degree-1. The results show that 1.67 and 5.0 cycles degree-1 elicit good accommodation responses which are temporally stable. All five subjects employed were unable to maintain an accurate accommodation response to a 15 cycles degree-1 grating. Consideration of the changes occurring in the retinal modulation with accommodative error indicates that spatial frequencies around 5.0 cycles degree-1 are the most useful for accommodation.
Ward
P A
PA
Department of Ophthalmic Optics, UMIST, Manchester, U.K.
D000065:Accommodation, Ocular; D000328:Adult; D005260:Female; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D008297:Male; D010364:Pattern Recognition, Visual / Q000502:physiology*; D011680:Pupil; D012684:Sensory Thresholds / Q000502:physiology; D013997:Time Factors