Purchase this article with an account.
Anita J. Simmers, Lyle S. Gray, Paul V. McGraw, Barry Winn; Functional Visual Loss in Amblyopia and the Effect of Occlusion Therapy. Invest. Ophthalmol. Vis. Sci. 1999;40(12):2859-2871.
Download citation file:
© ARVO (1962-2015); The Authors (2016-present)
purpose. The aim of this study was to define the nature of functional visual
loss in amblyopia and to identify those subjects whose amblyopia is
chiefly due to one or more of the following deficits: abnormal contour
interaction, abnormal eye movements, abnormal contrast perception, or
methods. Fifty amblyopic children with a mean age of 5.6 ± 1.3 years were
referred from diverse sources. In addition to routine orthoptic and
optometric evaluation the principal visual deficits in the amblyopic
eye of each subject were identified using the following measures of
visual acuity: high contrast linear, single optotype, repeat letter and
low contrast linear, plus Vernier and displacement thresholds. These
measures were repeated as the children underwent a prescribed occlusion
therapy regime, after parental consent.
results. All amblyopic subjects demonstrated a functional loss in each of the
tests used, and occlusion therapy appeared to improve all aspects of
the amblyopia. High contrast visual acuity was not always the primary
deficit in visual function, and when amblyopic subjects were divided
according to their primary visual loss, this visual function was found
to show the greatest improvement with treatment.
conclusions. These results suggest that to successfully identify the primary visual
deficit and monitor the success of occlusion therapy it is necessary to
assess other aspects of visual function in
This PDF is available to Subscribers Only