摘要:

Slowly rotating, cylindrical, diffusing drums have been widely used in laser refraction. A simple geometrical evaluation of the optical path lengths involved is used to derive expressions for the position of the plane of stationarity and the apparent speed of speckle motion as a function of the characteristics of the illuminating wavefront, the drum, the refraction of the observer, and other system parameters. With apparatus of known characteristics, determination of the apparent speckle velocity allows calculation of the ametropia of the observer.

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

摘要:

The Ophthalmetron® was used to measure the refractive error of 10 male optometry students. Although there was a high incidence of invalid readings, more repeatable results were obtained with use of a cycloplegic. Measurements made under cycloplegia revealed 0.41 D more hyperopia but no differences in astigmatism as compared to the noncycloplegic refraction. Instrument myopia was shown not to be a factor.

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

摘要:

Five patients were each fitted with polymethylacrylate (PMMA), BP Flex®, and Polycon® corneal contact lenses of the same dimensions. Corneal edema was monitored with a slit-lamp biomicroscope and pachometer. Lenses were worn in a double-masked and random sequence for periods of 6 hr. Patients developed less corneal edema with Polycon® lenses than with PMMA lenses. There was no significant difference in corneal edema with PMMA and BP Flex® lenses. Those patients who developed little corneal edema with optimum-fitting PMMA lenses also developed little edema with the BP Flex® and Polycon® lenses. Steeper-fitting PMMA and BP Flex® lenses produced more corneal edema than optimum-fitting lenses made of the same materials, while steeper-fitting Polycon® lenses produced only slightly more edema than the optimum-fitting Polycon® lenses.

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

摘要:

The position of the apex of the cornea was found for 1000 “normal” eyes (500 right; 500 left) from photoelectronic keratoscopic analysis. The corneal apex was located on the vertical meridian in 21.3% of the eyes, temporally in 62.4%, and nasally in 16.3%. Although a temporally biased location for the corneal apex was demonstrated, 62.2% of the eyes had the apex within 0.5 mm of the visual axis. The implications of these findings in contact lens fitting are discussed.

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

摘要:

Some visual characteristics of the chronic alcoholic were investigated in a sample of 100 male alcoholic patients and 100 matched controls. The purpose of the retrospective study was to determine whether these characteristics may contribute to an increased motor vehicle accident rate among alcoholics. Significant differences between the two groups, which might affect driving abilities, were found for color vision deficiencies and the breakage and loss rate of spectacles. No significant differences were found for stereopsis deficiencies, limitation of visual field, distance phorias, ductions, or the need to wear spectacles for driving. An analysis of the refractive data suggests that alcoholic patients may be slightly more hyperopic and less astigmatic than others; however, these differences are not sufficient to influence driving ability.

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

摘要:

A possible case of unilateral retinitis pigmentosa (RP) is reviewed. The electrodiagnostic and clinical findings are discussed, with perspective given to alternative diagnoses. A review of the literature is included to show the controversy which clouds a positive diagnosis of unilateral RP. A co-existing Marcus Gunn pupil is defined and discussed in relation to unilateral RP-like processes.

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

摘要:

Among 1,000 psychiatric patients in a Veterans Administration hospital, there were 15 in the age group 21 −41 years who complained of difficulty at near and who showed reduced accommodation. All 15 were receiving benztropine mesylate (Cogentin) and most also received a phenothiazine or a butyrophenone. The reduction in accommodation ranged from 40 to 100%. Data are insufficient to correlate doses of specific drugs with the precise extent of the impairment of accommodation.

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

摘要:

Skills of interviewing, counseling, and patient management have been identified as vital parts of the ASCO curriculum model. This paper reviews the current status of the affective components of the optometric curriculum and describes a course which has as its goal the teaching of affective skills to optometry students.

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

摘要:

Dark adaptation has been measured with a new type of dark adaptometer in a group of 25 normal subjects, and in a group of 10 patients suffering from a variety of retinal pathologies. The results indicate that this instrument is capable of distinguishing between normal and pathological dark adaptation on the basis of data obtained in two clinical samples.

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

摘要:

A retinoscope that uses a He-Ne laser as its light source has been designed. By this means it is possible to improve the performance of the conventional retinoscope. In particular the contrast of the fundus reflex has been enhanced and the retinoscope can be used at a greater working distance than usual. By using a polarized laser the specular reflections from the eye are completely suppressed. The retinoscope lends itself to refractions under normal room illumination. Patients find the light from the laser retinoscope less bothersome than that of the usual tungsten filament lamp. Advantages and disadvantages of the unit are discussed.

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID