Document Detail


Infant hyperacuity for radial deformation.
MedLine Citation:
PMID:  11006232     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: Poor response rates and/or the confounding of motion and offset responses make it difficult to interpret results of previous studies of infant hyperacuity. The aim of the present study was to design a protocol that overcomes these limitations and to investigate the normal maturation of hyperacuity. METHODS: Hyperacuity of 31 healthy term infants aged 4 to 12 months was measured using radial deformation of static circular D4 patterns with a two-alternative, forced-choice, preferential-looking (FPL) protocol and maximum likelihood threshold estimation. FPL grating resolution acuity was assessed on the same visit. RESULTS: Both hyperacuity and resolution acuity were 1.1 to 1.2 logMAR (12-16 minutes arc) at 4 months of age. Hyperacuity improved rapidly to approximately 0.3 logMAR (2.0 minutes arc) by 9 to 12 months of age. This 0.9 log unit improvement in the hyperacuity still leaves the 12-month-old infant at a level 0.4 log unit poorer than adults' thresholds. Resolution acuity improved more gradually to approximately 0.7 logMAR (5 minutes arc) by 9 to 12 months of age. This 0.4 log unit improvement leaves the 12-month-old infant at a level 0.6 log unit poorer than adults' resolution acuity. CONCLUSIONS: Hyperacuity measured via radial deformation thresholds matures very rapidly between 4 and 6 months of age and continues to mature more slowly throughout infancy and into early childhood. The radial deformation protocol may provide a sensitive index for detecting and monitoring abnormalities in spatial vision in cases of infantile esotropia.
Authors:
E E Birch; W H Swanson; Y Z Wang
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Investigative ophthalmology & visual science     Volume:  41     ISSN:  0146-0404     ISO Abbreviation:  Invest. Ophthalmol. Vis. Sci.     Publication Date:  2000 Oct 
Date Detail:
Created Date:  2000-10-12     Completed Date:  2000-10-12     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7703701     Medline TA:  Invest Ophthalmol Vis Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  3410-4     Citation Subset:  IM    
Affiliation:
Retina Foundation SW, Dallas, Texas 75231, USA. ebirch@retinafoundation.org
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MeSH Terms
Descriptor/Qualifier:
Adult
Form Perception*
Humans
Infant
Middle Aged
Sensitivity and Specificity
Vision Tests / instrumentation,  methods*
Visual Acuity / physiology*
Grant Support
ID/Acronym/Agency:
EY05236/EY/NEI NIH HHS

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


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