Diagnosis and Management of Ocular Motility Disorders by Alec M. Ansons

By Alec M. Ansons

Manchester Royal Eye clinic, Oxford, united kingdom. continues the elemental framework of the former variation, c1991, and features a new bankruptcy on an 'Introduction to Concomitant Strabismus,' with all different chapters revised and up to date. Halftone illustrations. DNLM: Ocular Motility Disorders--diagnosis.

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PROBLEMS If spectacles are prescribed they must be correctly centred and accurately fitted; even a slight displacement can result in diplopia as well as adversely affecting vision. Patients with bilateral aphakia sometimes have problems in converging; decentration to produce basein prism effect may therefore be indicated in reading spectacles. 50 or +3 DS will be required in both eyes whichever method of correcting the aphakia is used. Bifocal glasses are indicated for children and are also often preferred by adults.

Linear testing Influence and assessment of the crowding effect Chart design Electrodiagnostictests for visual function Equipment Clinical applications Further investigationwhen defective visual acuity is recorded or estimated Fixation Fundus photography References light and dark. It is mediated by the transduction of light into electrical energy in the retinal receptors, and is most acute in the rods of the dark-adapted eye when the rhodopsin has been fully resynthesized. It is maximum in the range 3-8" away from the fovea.

GUIDELINES The patient should be asked details of his working distance and the correction should be modified accordingly. If necessary he should be prescribed two Refraction 33 pairs of near glasses, one for working distance and the other for a normal reading distance-this could apply, for example, to musicians requiring glasses to read music. Once the best near correction is obtained, each eye should be checked separately to ensure that the optimum distance is the same in each eye, otherwise the patient is unlikely to be comfortable.

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