摘要:

A qualitative analysis of the literature on heredo-familial optic atrophies was necessitated by the indefinite status of the dominant juvenile form within their nosology. A quantitative analysts of those papers considered to report the dominant juvenile form revealed eight major clinical manifestations: (1) Dominant autosomal inheritance. (2) Insidious onset between the ages of 4–8 years. (3) Moderately reduced visual acuity, 6/20–6/60. (4) Temporal pallor of the optic discs. (5) Centro-caecal enlargement of the blind spot. (6) Full peripheral fields to white. (7) Inverted peripheral fields to colors. (8) An acquired blue-yellow dyschromatopsia. They are proposed as a clinical definition of the disease and as suitable diagnostic criteria. Fourteen affected persons from three unrelated families were diagnosed by the criteria. The site or mechanism of the disease is not known.

ISSN:0002-9408    

出版商:OVID    

年代:1972

数据来源: OVID

摘要:

A study of the luminance of fluorescent light emitted by sodium fluorescein solutions of concentrations and thicknesses normally present in the contact lens fitting situation showed that luminance is directly proportional to concentration and to thickness.

ISSN:0002-9408    

出版商:OVID    

年代:1972

数据来源: OVID

摘要:

This paper discusses evidence for the development of ability in the physical, physiological and psychological phases of visual acuity. Visual acuity tests of various kinds were administered to 674 children between the first and sixth year of life and the results suggest that high levels of visual acuity are present at a very early age. The data show no development trend in the age groups beyond the third year of life. Apparent development prior to age three may be an artifact due to the inability of examiners to present comparable tests. Comparison of the present sample and a sample of older children shows the preschool sample to possess a higher level of visual efficiency. This suggests that growth and environment are effective in reducing efficiency earlier in life than was thought heretofore.

ISSN:0002-9408    

出版商:OVID    

年代:1972

数据来源: OVID

摘要:

Results are discussed of original research on the effect of the main variables involved in the detection of early visual loss in the central field, with particular reference to the use of flashed stimuli of short duration of exposure (approximately 200 milliseconds). The importance of retinal adaptation, stimulus size, luminance, and retinal location is discussed, together with the effect of age. Variations in visibility, that can be regarded as within physiological limits, are indicated.

ISSN:0002-9408    

出版商:OVID    

年代:1972

数据来源: OVID

摘要:

Closcup photographs were taken of each eye of 163 patients who had obtained and were wearing contact lenses. These photographs were taken in both an illuminated and a dark environment. Twenty-three variables were recorded and seven of these, relative to the pupil diameter, were analyzed. These data were then evaluated against the findings of other investigators.

ISSN:0002-9408    

出版商:OVID    

年代:1972

数据来源: OVID

摘要:

The performance of a lens or protective shield can be described in terms of degradation of contrast, “contrast transfer” or “modulation transfer”—produced by that lens or shield for specific angular resolutions. The performance so described can be directly related to the seeing requirements of the wearer. The use of a modulation transfer specification is essential in applying tolerances to zones, scratches and haze in contact lenses and other plastic materials. Techniques, problems, and experimental results are discussed.

ISSN:0002-9408    

出版商:OVID    

年代:1972

数据来源: OVID

摘要:

A platform for holding animals before a slit lamp for observing and photographing the eyes is described.

ISSN:0002-9408    

出版商:OVID    

年代:1972

数据来源: OVID

摘要:

This paper describes the treatment of severe field loss culminating in the treatment of retinitis pigmentosa with binocular nasal and temporal prisms. Included in the paper are case histories and clinical procedures to determine the proper placement of the prisms.

ISSN:0002-9408    

出版商:OVID    

年代:1972

数据来源: OVID

摘要:

Interpupillary measurements were made employing four techniques. Three methods employed pupillometers. two of which measured interpupillary distances at infinity and one both at infinity and the near visual distance. A significant error was found employing a ruler while pupillometers showed a good correlation.

ISSN:0002-9408    

出版商:OVID    

年代:1972

数据来源: OVID

ISSN:0002-9408    

出版商:OVID    

年代:1972

数据来源: OVID