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This method measures eccentric fixation in amblyopia, indicating its relevance for visual acuity assessment.
Eccentric fixation may be measured in prism diopters in amblyopic eyes by means of a simple device. A pinhole slightly eccentric to the geometric center of a circular disc is used: as the disc rotates the observer observes entoptically a filmy pattern of his retinal vasculature. The method has been tested on 240 eyes and a high degree of correlation was found between the amount of eccentric fixation and the decrement in acuity.
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KOPPENBERG et al. (1972) studied this question.
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