Document Detail


Human infants' accommodation responses to dynamic stimuli.
MedLine Citation:
PMID:  17251499     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: A young infant's environment routinely consists of moving objects. The dynamics of the infant accommodative system are almost unknown and yet have a large impact on habitual retinal image quality and visual experience. The goal of this study was to record infants' dynamic accommodative responses to stimuli moving at a range of velocities.
METHODS: Binocular accommodative responses were recorded at 25 Hz. Data from infants 8 to 20 weeks of age and pre-presbyopic adults were analyzed. A high-contrast image of a clown was moved between 20- and 50-cm viewing distances at four velocities (a step, 50 cm/s, 20 cm/s, and 5 cm/s).
RESULTS: Most infants who had clear responses were able to initiate their response within a second of stimulus onset. The infants were able to discriminate the different stimulus velocities and to adjust their response velocities and durations in an appropriate fashion.
CONCLUSIONS: The data indicate that by the third postnatal month infants are able to respond with latencies within a factor of two of adults' and that there is little immaturity in the motor capabilities of the accommodative system compared with the sensory visual system at the same age.
Authors:
Grazyna M Tondel; T Rowan Candy
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Investigative ophthalmology & visual science     Volume:  48     ISSN:  0146-0404     ISO Abbreviation:  Invest. Ophthalmol. Vis. Sci.     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2007-01-25     Completed Date:  2007-03-01     Revised Date:  2013-06-06    
Medline Journal Info:
Nlm Unique ID:  7703701     Medline TA:  Invest Ophthalmol Vis Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  949-56     Citation Subset:  IM    
Affiliation:
Indiana University School of Optometry, Bloomington, Indiana 47405, USA.
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MeSH Terms
Descriptor/Qualifier:
Accommodation, Ocular / physiology*
Adult
Humans
Infant
Motion Perception / physiology*
Retina / physiology
Vision, Binocular / physiology*
Grant Support
ID/Acronym/Agency:
R01 EY014460/EY/NEI NIH HHS; R01 EY014460-02/EY/NEI NIH HHS; R01 EY014460-03/EY/NEI NIH HHS; R01 EY014460-04/EY/NEI NIH HHS
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