| Human infants' accommodation responses to dynamic stimuli. | |
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MedLine Citation:
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PMID: 17251499 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Grazyna M Tondel; T Rowan Candy |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural |
Journal Detail:
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Title: Investigative ophthalmology & visual science Volume: 48 ISSN: 0146-0404 ISO Abbreviation: Invest. Ophthalmol. Vis. Sci. Publication Date: 2007 Feb |
Date Detail:
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Created Date: 2007-01-25 Completed Date: 2007-03-01 Revised Date: 2011-01-11 |
Medline Journal Info:
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Nlm Unique ID: 7703701 Medline TA: Invest Ophthalmol Vis Sci Country: United States |
Other Details:
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Languages: eng Pagination: 949-56 Citation Subset: IM |
Affiliation:
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Indiana University School of Optometry, Bloomington, Indiana 47405, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Accommodation, Ocular
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physiology* Adult Humans Infant Motion Perception / physiology* Retina / physiology Vision, Binocular / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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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 |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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