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Effects of optical defocus and spatial contrast on anterior chamberdepth in chicks
Author(s) -
Barutchu Ayla,
Crewther SheilaG,
Crewther DavidP
Publication year - 2002
Publication title -
clinical and experimental ophthalmology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.3
H-Index - 74
eISSN - 1442-9071
pISSN - 1442-6404
DOI - 10.1046/j.1442-9071.2002.00514.x
Subject(s) - retinoscopy , contrast (vision) , refractive error , vitreous chamber , medicine , ophthalmology , lens (geology) , optics , spatial frequency , refraction , optometry , eye disease , physics
The goal of this study was to investigate the effect of optical defocusand spatial contrast on refractive development and, in particular,on anterior chamber growth. Ninety chicks were raised from day 4−10post‐hatching wearing monocular lenses (±10 Dor 0 D), in an environment with either high, low or nospatial contrast patterns: 30%, 6% or 0% contrast, respectively.At day 10, the chicks’ refractive state and ocular componentswere assessed using retinoscopy and A‐scan ultrasonography. Oculardefocus resulted in sign‐dependent significant differences in refractiveerror, axial length and vitreous chamber depth. Lens wear also ledto significant spatial contrast dependent changes in anterior chamber depth.Varying ambient spatial contrast in the chick’s environmentdid not inhibit emmetropization processes; however, anterior chambergrowth was particularly susceptible to changes in spatial contrast.