摘要:

Motor-driven prism stereoscope vergence tests, base in break, base in recovery, base out break, and base out recovery, repeated three times (BIB, BIR, BOB, BOR x 3) were given to three separate groups. Two instruments with different speeds were used. Repeated testing shows a slight trend to convergence in slower machines. The results from both machines are still comparable. Means are similar to previously published norms from hand-turned instruments, but the variance of scores is about twice as large and there is an eso trend at near. The motor drive aids discrimination, since Ss who are capable can now follow with smooth vergences over a wider range. In general, there is no substantial trend with age between 3 and 25 years other than those which may be due to decreasing response times. Vergence scores can be adequately reduced to two independent factors, loading on convergence and divergence, respectively, which suggests that there are two processes varying independently in maturation and therapy as well as assessment.

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

摘要:

The two visual responses, contrast threshold and border enhancement, are both affected by retinal image quality. Thus, with increasing defocus of the retinal image, contrast thresholds with sinusoidal line gratings increase, and the enhanced region near a border becomes wider. These two visual responses were compared to determine their suitability as gauges of retinal image quality. Border enhancement was found to be more sensitive to deterioration of the retinal image in the form of defocus than contrast thresholds throughout the greater portion of the grating frequency spectrum. However, the contrast threshold increases in sensitivity toward cutoff frequency, and beyond a certain high frequency it surpasses border enhancement in that respect. At the same time, for these optimum frequencies, the contrast range is exhausted within a relatively small defocus range. Therefore, a limitation is imposed on the usefulness of the contrast threshold as an index of retinal image quality.

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

摘要:

Effective research should be based on familiarity with what has already been accomplished in the field. The best place to look for this information is a library, since even the most widely read professional may miss much that is relevant. Libraries not only provide access to their own holdings but assist the investigator by means of computerized literature searches and the use of indexes, abstracts, and other forms of printed reference material. Efficient use of Iibrary facilities can aid research and facilitate preparation of grant proposals.

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

摘要:

A questionnaire survey of 1277 students in colleges of liberal arts, medicine, pharmacy, nursing, dentistry, and podiatry was undertaken in an effort to determine their knowledge and use of vision care services. Students were asked to define the differences among optometrists, ophthalmologists, and opticians. Utilization, type of practitioner used, and site of examination are reported. About 56% had had an examination within the past year. Optometrists provided at least 40% of the examinations, but the confusion in the minds of the students is revealed by the fact that some said they were examined by opticians, some by the Department of Motor Vehicles, and some by a person they were not able to identify. Clearly, optometry and the related disciplines have a responsibility to clarify the public confusion.

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

摘要:

This paper presents the results of a cross-sectional survey of intraocular pressures in patients of the University Optometric Center, the clinical facility of the State College of Optometry, SUNY. The study consisted of two parts: a pilot study conducted by one of the authors and a survey of patient records that were reviewed at random with particular emphasis on patients under 10. The results indicate that the intraocular pressure norms used to evaluate the general population are also appropriate for evaluation of patients under 10 years of age.

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

摘要:

Monocular acuities, in two infants with nonaccommodative comitant esotropia, were measured before and during occlusion therapy. The results indicate that strabismic amblyopia is present within the first year of life and that the infant visual system is remarkably sensitive to short periods of monocular occlusion during this time period.

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID

摘要:

A patient with bitemporal hemianopia due to a pituitary tumor was followed postsurgically for 4 years. Visual fields and acuities were assessed at regular intervals under the same lighting conditions and with the same instrumentation. The changes in the visual field were both striking and unusual, as they did not correlate with those reported in the literature in other patients with pituitary tumors.

ISSN:0093-7002    

出版商:OVID    

年代:1979

数据来源: OVID