Document Detail

Effects of optical defocus and spatial contrast on anterior chamber depth in chicks.
MedLine Citation:
PMID:  12010218     Owner:  NLM     Status:  MEDLINE    
The goal of this study was to investigate the effect of optical defocus and spatial contrast on refractive development and, in particular,on anterior chamber growth. Ninety chicks were raised from day 4-10 post-hatching wearing monocular lenses (+/-10 Dor 0 D), in an environment with either high, low or no spatial contrast patterns: 30%, 6% or 0% contrast, respectively. At day 10, the chicks' refractive state and ocular components were assessed using retinoscopy and A-scan ultrasonography. Ocular defocus resulted in sign-dependent significant differences in refractive error, axial length and vitreous chamber depth. Lens wear also led to significant spatial contrast dependent changes in anterior chamber depth. Varying ambient spatial contrast in the chick's environment did not inhibit emmetropization processes; however, anterior chamber growth was particularly susceptible to changes in spatial contrast.
Ayla Barutchu; Sheila G Crewther; David P Crewther
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Clinical & experimental ophthalmology     Volume:  30     ISSN:  1442-6404     ISO Abbreviation:  Clin. Experiment. Ophthalmol.     Publication Date:  2002 Jun 
Date Detail:
Created Date:  2002-05-15     Completed Date:  2002-07-29     Revised Date:  2009-11-03    
Medline Journal Info:
Nlm Unique ID:  100896531     Medline TA:  Clin Experiment Ophthalmol     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  217-20     Citation Subset:  IM    
School of Psychological Science, La Trobe University, Melbourne, Victoria, Australia.
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MeSH Terms
Animals, Newborn
Anterior Chamber / growth & development,  pathology*
Chickens / growth & development,  physiology*
Contrast Sensitivity*
Eye / growth & development
Perceptual Disorders / physiopathology*
Refractive Errors / physiopathology*
Sensory Deprivation
Space Perception*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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