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Clinical Evaluation of an Infrared Refracting Instrument

Clinical Evaluation of an Infrared Refracting Instrument 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. References 1. Safir A: Automatic objective refraction. Read before the 74th annual session of the American Academy of Ophthalmology and Otolaryngology, Chicago, 1969. 2. Safir A, Knoll H, Mohrman R: Automatic objective refraction: Report of a clinical trial . Trans Am Acad Ophthalmol Otolaryngol 74:1266-1275, 1970. 3. Knoll H, Mohrman R, Maier WL: Automated refraction in an office practice . Am J Optom 47:644-649, 1970.Crossref 4. Knoll H, Mohrman R: The ophthalmetron: Principles and operation . Am J Optom 49:122-129, 1972.Crossref 5. Safir Ophthalmetron Reference Manual. Rochester, NY, Bausch and Lomb Inc (accompanies the instrument). 6. Safir A, et al: A new method of vision care delivery. Health Serv Rep, to be published. 7. Safir A, et al: Studies in refraction: I . Arch Ophthalmol 84:49-61, 1970.Crossref 8. Hyams L, Safir A, Philpot J: Studies in refraction: II. Bias and accuracy of retinoscopy . Arch Ophthalmol 85:33-41, 1971.Crossref http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Ophthalmology American Medical Association

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Publisher
American Medical Association
Copyright
Copyright © 1974 American Medical Association. All Rights Reserved.
ISSN
0003-9950
eISSN
1538-3687
DOI
10.1001/archopht.1974.01010010109005
Publisher site
See Article on Publisher Site

Abstract

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. References 1. Safir A: Automatic objective refraction. Read before the 74th annual session of the American Academy of Ophthalmology and Otolaryngology, Chicago, 1969. 2. Safir A, Knoll H, Mohrman R: Automatic objective refraction: Report of a clinical trial . Trans Am Acad Ophthalmol Otolaryngol 74:1266-1275, 1970. 3. Knoll H, Mohrman R, Maier WL: Automated refraction in an office practice . Am J Optom 47:644-649, 1970.Crossref 4. Knoll H, Mohrman R: The ophthalmetron: Principles and operation . Am J Optom 49:122-129, 1972.Crossref 5. Safir Ophthalmetron Reference Manual. Rochester, NY, Bausch and Lomb Inc (accompanies the instrument). 6. Safir A, et al: A new method of vision care delivery. Health Serv Rep, to be published. 7. Safir A, et al: Studies in refraction: I . Arch Ophthalmol 84:49-61, 1970.Crossref 8. Hyams L, Safir A, Philpot J: Studies in refraction: II. Bias and accuracy of retinoscopy . Arch Ophthalmol 85:33-41, 1971.Crossref

Journal

Archives of OphthalmologyAmerican Medical Association

Published: Aug 1, 1974

References