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Eileen E. Birch, William H. Swanson, Yi-Zhong Wang; Infant Hyperacuity for Radial Deformation. Invest. Ophthalmol. Vis. Sci. 2000;41(11):3410-3414.
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purpose. Poor response rates and/or the confounding of motion and offset
responses make it difficult to interpret results of previous studies of
infant hyperacuity. The aim of the present study was to design a
protocol that overcomes these limitations and to investigate the normal
maturation of hyperacuity.
methods. Hyperacuity of 31 healthy term infants aged 4 to 12 months was measured
using radial deformation of static circular D4 patterns with a
two-alternative, forced-choice, preferential-looking (FPL) protocol and
maximum likelihood threshold estimation. FPL grating resolution acuity
was assessed on the same visit.
results. Both hyperacuity and resolution acuity were 1.1 to 1.2 logMAR (12–16
minutes arc) at 4 months of age. Hyperacuity improved rapidly to
approximately 0.3 logMAR (2.0 minutes arc) by 9 to 12 months of age.
This 0.9 log unit improvement in the hyperacuity still leaves the
12-month-old infant at a level 0.4 log unit poorer than adults’
thresholds. Resolution acuity improved more gradually to approximately
0.7 logMAR (5 minutes arc) by 9 to 12 months of age. This 0.4 log unit
improvement leaves the 12-month-old infant at a level 0.6 log unit
poorer than adults’ resolution acuity.
conclusions. Hyperacuity measured via radial deformation thresholds matures very
rapidly between 4 and 6 months of age and continues to mature more
slowly throughout infancy and into early childhood. The radial
deformation protocol may provide a sensitive index for detecting and
monitoring abnormalities in spatial vision in cases of infantile
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