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Article
August 1974

Clinical Evaluation of an Infrared Refracting Instrument

Author Affiliations

Chicago
From the University of Illinois, Abraham Lincoln School of Medicine, Illinois Eye and Ear Infirmary, Chicago.

Arch Ophthalmol. 1974;92(2):103-108. doi:10.1001/archopht.1974.01010010109005
Abstract

Refractive errors of 567 eyes (286 patients), obtained by independent refractionists using retinoscopic and subjective techniques, were compared with those obtained by a trained technician operating the Ophthalmetron.

The Ophthalmetron was incapable of producing an interpretable tracing in 26% of eyes, primarily because of poor fixation by the patients. The spherical power agreed within ± 0.5 diopter by the two objective methods in 52.6% of eyes. The cylindrical power agreed within ± 0.5 D by the two objective methods in 71.5% of eyes. The cylindrical axis measured by the two objective methods was within five degrees in 40% of eyes.

The principal limitations of the infrared refracting instrument are related to (1) the lack of cooperation in very young and very old individuals; (2) disease states limiting the transparency of the ocular media, such as cataracts; and (3) aphakia.

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