Background: Horizontal eye movements have been proposed to induce biomechanical stress and strain on optic\nnerve head. Since strabismus may lead to sustained adduction or abduction, we investigate the effects of long\nlasting unilateral horizontal strabismus on the morphology of optic disc.\nMethods: The observational cross-sectional study included patients with unilateral constant horizontal strabismus\nlasting for more than two years. The patients underwent an ophthalmological examination including refraction and\nmorphometry of the optic nerve head. A prism cover test using right angle glass prism was performed to measure\nthe magnitude of the ocular deviation.\nResults: The study included 70 patients with a unilateral constant strabismus (35 esotropic patients, 35 exotropic\npatients) with a mean age...............................
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