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J Am Optom Assoc. 1994 Sep;65(9):651-9.

Resistance to occlusion: sensitivity to induced blur in 6- to 12-month-old infants.

Author information

1
College of Optometry, University of Houston, TX 77204-6052.

Abstract

BACKGROUND:

Resistance to occlusion and fix and follow are often used to make inferences about the acuity of young children. In this study, the acuity of 6- to 12-month-old infants was degraded monocularly to elicit resistance to occlusion or loss of fixation.

METHODS:

Occlusion foils and optical blur were used to simulate monocular acuity reduction. Two different targets, a mechanical rabbit and a "flickering" light were used for fixation.

RESULTS:

More infants resisted occlusion when viewing the rabbit than the light. Resistance to occlusion was observed in the majority of infants when acuity was degraded to the level expected for 6 to 12-month-old infants (20/80-20/300).

CONCLUSIONS:

The sensitivity of resistance to occlusion is influenced by the test target and if an interesting target is used, resistance to occlusion may be a useful tool for detecting interocular acuity differences in 6- to 12-month-old infants.

PMID:
7963225
[Indexed for MEDLINE]

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