摘要:

Anatomical and neurophysiological studies suggest a relationship between “abnormal” visual pathways and strabismus found in the Siamese cat. A telephotographic method for measuring eye positions in these cats reveals that newborn Siamese cats have a conspicuous exotropia appearance. Adult animals appear to have esotropia, orthophoria, or exotropia, which can be intermittent.

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

摘要:

The genetic polymorphism of human color vision is examined within the framework of a photopigment replacement model. An analysis of the X-linked recessive dichromacies and anomalous trichromacies indicates that one source of variability of normal color perception may be the inclusion of several distinct phenotypes in what is usually described as normal color vision. This analysis also reveals the cause of the dominance hierarchy at the protan and deutan loci, the perceptual effects of dosage compensation, and the phenotypes of various compound hemizygotes.

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

摘要:

Looking through optical instruments stimulates the eye to accommodate more than would be necessary for naked eye viewing; this increased near power is called instrument myopia. The amount (up to −5 diopters) varies with the observer and the conditions of viewing. Using microscopes produces −2.5 to −2 diopters of instrument myopia. More instrument myopia is found with low-power magnification, inexperienced users, and when focusing from minus blur to sharp image. Physiologically, the instrument myopia appears to be associated with an accommodative equilibrium position and, psychologically, with a sensing of proximity.

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

摘要:

Stereopsis thresholds were measured on 242 subjects with normal visual acuity and ranging in age from 8 to 46 years. The results showed no trend with age and no significant sex difference. The log-second threshold mean u as 0.74 ± 0.21 with a test-retest reliability coefficient of 0.70 ± 0.05.

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

摘要:

Clinical electroretinography is an uncomfortable, disquieting experience for a patient because of the contact lens electrodes used. Such electrodes are either expensive to buy or difficult to make. An aluminized Mylar electrode performs satisfactorily, elicits minimal patient apprehension or discomfort without topical anesthesia, is simple to make, and is disposable.

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

摘要:

A 22-year-old patient having a history of congenital strabismus with surgery at age 6 and again at age 14 suffered from a limitation of dextroversion following 2 surgical procedures with diplopia initially experienced beyond 18°. Ten sessions of treatment by traditional visual training methods and biofeedback reinforcement were compared in extending the deficient range of dextroversion. Biofeedback was found to be significantly better than conventional approaches in this treatment.

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

摘要:

The statistical measures and definitions currently in use for screening programs are discussed. Sensitivity, specificity, false negative, and false positive rates are defined and illustrated. The positive and negative predictive values and the over- and underrefferal rates are also discussed, and an example of these measures is provided. The relationship of rates to prevalence and expected screening results is shown. A method for calculating the standard error of sensitivity and specificity is also given.

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

摘要:

The use of crude practitioner to population ratios when age-specific ratios are more appropriate can lead to significant errors in estimates of the need for health care manpower. A comparison of these 2 methods is made using age-specific data for Florida as an example. A brief survey of other epidemiological factors affecting clinical manpower projections is given.

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

摘要:

This is a review of papers on ocular manifestations of systemic diseases published, in essence, during the period from October 1, 1974 to September 30, 1975, with emphasis on papers that may contain knowledge of interest to optometrists.

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID