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Invest Ophthalmol Vis Sci. 2012 Aug 9;53(9):5386-94. doi: 10.1167/iovs.12-9941.

Eye position stability in amblyopia and in normal binocular vision.

Author information

1
Vision Science Research Program, Toronto Western Hospital, Toronto, Ontario, Canada. esther.gonzalez@utoronto.ca

Abstract

PURPOSE:

We investigated whether the sensory impairments of amblyopia are associated with a decrease in eye position stability (PS).

METHODS:

The positions of both eyes were recorded simultaneously in three viewing conditions: binocular, monocular fellow eye viewing (right eye for controls), and monocular amblyopic eye viewing (left eye for controls). For monocular conditions, movements of the covered eye were also recorded (open-loop testing). Bivariate contour ellipses (BCEAs), representing the region over which eye positions were found 68.2% of the time, were calculated and normalized by log transformation.

RESULTS:

For controls, there were no differences between eyes. Binocular PS (log(10)BCEA = -0.88) was better than monocular PS (log(10)BCEA = -0.59) indicating binocular summation, and the PS of the viewing eye was better than that of the covered eye (log(10)BCEA = -0.33). For patients, the amblyopic eye exhibited a significant decrease in PS during amblyopic eye (log(10)BCEA = -0.20), fellow eye (log(10)BCEA = 0.0004), and binocular (log(10)BCEA = -0.44) viewing. The PS of the fellow eye depended on viewing condition: it was comparable to controls during binocular (log(10)BCEA = -0.77) and fellow eye viewing (log(10)BCEA = -0.52), but it decreased during amblyopic eye viewing (log(10)BCEA = 0.08). Patients exhibited binocular summation during fellow eye viewing, but not during amblyopic eye viewing. Decrease in PS in patients was mainly due to slow eye drifts.

CONCLUSIONS:

Deficits in spatiotemporal vision in amblyopia are associated with poor PS. PS of amblyopic and fellow eyes is differentially affected depending on viewing condition.

PMID:
22789926
DOI:
10.1167/iovs.12-9941
[Indexed for MEDLINE]

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