ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

Since it has been shown that (1) fluid instilled in the pouch created by pulling the lower lid away from the eyeball is entrapped, (2) no fluids move into the lacrimal sac when the eyelids are shut, and (3) gravity is important in tear-flow dynamics, we reasoned that an instillation technique for topical ocular drugs could be devised which would increase the drug effect for a given amount of drug. To test this hypothesis we administered one drop of 0.5% tropicamide to the right eyes of 12 young adults using an experimental method of instillation and to the left eyes using the conventional technique. The experimental technique produced a significantly greater loss of accommodation than the conventional technique. With this experimental or similar technique, it may be possible to use lower concentrations of a drug to produce the same ocular effects produced by a higher concentration instilled in the conventional manner.

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

Failure heights were measured in drop-ball tests for both chemtempered and heat-tempered piano, white crown glass lenses from five different optical laboratories. It was found that (1) failure height was proportional to the square of the lens thickness, (2) chemtempered lenses substantially thinner than 2.0 mm are as resistant to breakage as 2.0-mm-thick heat-tempered lenses, and (3) a close correlation existed between results of single-drop and multiple-drop tests and between results of tests using rigid and compliant mounts.

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

When a Maxwellian-view test field is alternately presented through different small areas in the pupil, a residual flicker is observed even though the luminance of the field is adjusted to compensate for the Stiles-Crawford effect. The stimulus alternation frequency that eliminated this residual flicker was used to estimate the magnitude of modulation in the receptors resulting from the difference in direction of illumination. These results support the concept that directional sensitivity of cones is much more acute than the directional sensitivity represented by conventional measures of the Stiles-Crawford effect.

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

Reduction of chromatic aberration is one of the suggested functions of yellow ocular filters. This possibility was tested by (1) determining the effect of an artificial yellow filter on the chromatic aberration of the eye of two fish species having no obvious ocular filters and (2) comparing in vivo chromatic aberration with that of the excised lens in a species of fish having a yellow cornea. The results indicate that yellow filters reduce the measured chromatic aberration of the eye by more than one-third.

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

Monocular diplopia, reported by a subject following near work, was shown to be caused by changes in the corneal topography. Prior slit lamp biomicroscopy had revealed no corneal abnormality. The degree of corneal distortion and ray tracing calculations confirmed the presence and position of the resultant diplopia.

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

Cone-rod dystrophy is considered one of the rarer hereditary retinal degenerations. This disease can be easily mistaken for a number of other conditions because of its unusual characteristics. This paper discusses these characteristics and presents a case report to illustrate how the optometrist can effectively manage patients with this disease.

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

A home therapy method for eliminating anomalous correspondence is described. This method is applicable to patients over 12 yr old with esotropia greater than 15–20A. A case report is included.

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

摘要:

An inexpensive, headborne device is described that provides a bright spot of light on reading material even when the material is brought within 1 or 2 cm of the viewing eye. This aid has been used with great success by one of the authors for about 2 yr. This illuminator, or modifications of it, should prove valuable to other partially sighted people.

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID

ISSN:0093-7002    

出版商:OVID    

年代:1978

数据来源: OVID