Prism induced accommodation in infants 3 to 6 months of age.
Convergence-accommodation, one of several cross-linkages in the oculomotor system is manifested by opening the accommodative feedback loop and increasing the vergence input. We elicited this response in human infants aged 3-6 months by placing a 15 delta prism (base-out) before one eye while they viewed a diffuse patch of light. Accommodation was measured and ocular alignment was confirmed with a video photorefractor. The convergence-accommodation response is therefore present during a time when blur driven accommodation and disparity vergence are maturing. The gain of convergence-accommodation (expressed as the stimulus CA/C ratio) appeared to be greater for infants than adults.
Bobier
W R
WR
School of Optometry, University of Waterloo, Canada.
Guinta
A
A
Kurtz
S
S
Howland
H C
HC
D000065:Accommodation, Ocular / Q000502:physiology*; D000328:Adult; D000375:Aging / Q000502:physiology*; D003290:Convergence, Ocular / Q000502:physiology*; D006801:Humans; D007223:Infant; D008137:Longitudinal Studies; D012029:Refraction, Ocular