Professional paper

Stereoscopic Visual Acuity in Different Types of Amblyopia

Ljubica Dorn
Jelena Petrinović-Dorešić

Abstract

The signs of amblyopia include decreased visual acuity, enhanced crowding phenomenon, decreased accommodation ability, afferent pupillary defect, eccentric viewing, and also the loss of precise stereoscopic ability. The aim of the study was to assess stereoscopic visual acuity in different types of amblyopia. Stereoscopic visual acuity was tested and recorded in all of our amblyopic patients examined during one year. The Titmus polarized stereotest (housefly, set of circles, row of animals), and both Lang I and Lang II stereotests were used. The threshold levels of stereopsis determined in strabismic, anisometropic, ametropic and other forms of amblyopia are presented and discussed. In addition, results were compared with other parameters (visual acuity, refraction, binocular vision, and fixation). In organic amblyopias, stereopsis was absent. In visual deprivation amblyopias, stereopsis was partially present, only in a minor proportion of patients. In anisometropic amblyopias, however, a half of patients had normal and full stereopsis. The type of refractive error and the depth of amblyopia influence the presence of stereopsis. It is interesting to note that partial or absent stereopsis was not recorded in patients with mixed astigmatism. Determination of the level of stereopsis is a useful method in the diagnosis and classification of amblyopia.

Keywords

Stereoscopic Visual Acuity; Amblyopia

Hrčak ID:

14374

URI

https://hrcak.srce.hr/14374

Publication date:

2.4.2007.

Article data in other languages: croatian

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