Document Detail

Distance and near visual acuity in infantile nystagmus.
MedLine Citation:
PMID:  17106409     Owner:  NLM     Status:  MEDLINE    
PURPOSE: Infantile nystagmus (IN) has been reported to decrease with convergence. However, previous studies reported equivocal results regarding a corresponding improvement in acuity with near viewing. The aim of this study was to determine whether visual acuity improves with near viewing in patients with IN. METHODS: In the first experiment, visual acuities were measured using clinical test charts at standard test distances of 3 or 6 m and 40 cm and using S Charts at 3.75 m and 40 cm. In the second experiment, visual acuities were measured using a Bailey-Lovie chart at distance and a Lighthouse modified ETDRS near card held by each subject at his or her preferred working distance. S-chart acuities were obtained again at 3.75 m and 40 cm for comparison. Horizontal eye movements were recorded using infrared limbal reflection for 20 of the 34 subjects in the first experiment and for all 20 subjects in the second experiment. RESULTS: The S-chart acuities measured at distance and near were almost all within 0.1 logMAR (logarithm of the minimum angle of resolution) in experiments 1 and 2. Clinically measured acuity averaged nearly one line better at 40 cm than at distance in experiment 1, but the mean difference between near acuity using the ETDRS card and distance acuity using the Bailey-Lovie chart was less than one letter in experiment 2. No consistent relationship existed between the changes in visual acuity with viewing distance and the subject's eye movements. CONCLUSION: Despite a reduction of nystagmus at near distances in many patients with IN, the visual acuity at near does not improve significantly. These results imply that visual acuity in patients with IN is determined primarily by sensory limitations rather than by the moment-by-moment characteristics of these patients' eye movements.
Kara S Hanson; Harold E Bedell; Janis M White; Michael T Ukwade
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Optometry and vision science : official publication of the American Academy of Optometry     Volume:  83     ISSN:  1040-5488     ISO Abbreviation:  Optom Vis Sci     Publication Date:  2006 Nov 
Date Detail:
Created Date:  2006-11-19     Completed Date:  2007-01-04     Revised Date:  2007-12-03    
Medline Journal Info:
Nlm Unique ID:  8904931     Medline TA:  Optom Vis Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  823-9     Citation Subset:  IM    
University of Colorado at Denver and Health Sciences Center, Department of Ophthalmology, Aurora, Colorado, USA.
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MeSH Terms
Distance Perception / physiology*
Middle Aged
Nystagmus, Pathologic / physiopathology*
Retrospective Studies
Severity of Illness Index
Vision Tests / methods*
Visual Acuity / physiology*
Grant Support

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