摘要:

Changes in corneal thickness and the occurrence of vertical striae were monitored on 27 patients who wore both the “F”and “N” series Bausch and Lomb SoflensTM(polymacon) contact lenses. Changes in conical thickness were observed with both lenses, however, the “N” series lens caused slightly more corneal swelling. Vertical striae occurred in about 50% of the patients and was correlated with the development of corneal edema. In most cases where significant corneal edema was measured, it was possible to observe the edema using the biomicroscope.

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

Following reports of vision blur by scuba divers at depths below 100 feet, keratometric readings were taken on volunteers inside a hyperbaric chamber at the USAF School of Aerospace Medicine. It was found that as the pressure within the chamber increased, the corneal reading showed an increased dioptric value. This change in refractive condition also occurred in measurement on test steel balls. Whether this dynamic response was due to increased atmospheric index, or displacement of instrument optics, was explored.

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

Six low vision patients were fated with bioptic telescopes in order to obtain driver's licenses. They were given intensive coordinated training to prepare them for the complexities of driving a motor vehicle.

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

Because of their differences in emphasis, clinical practitioners and clinical epidemiologists often employ different terms and concepts in comparing and rating health screening tests. The apparent inconsistency of a high error rate (96 to 99% over-referrals) yet good test sensitivity and specificity (40% and 95% respectively) for tonometry can be explained by a complete analysis of tonometric screening. encompassing both the clinical and epidemiological view points. This paper reviews basic terminology, explains the clinical and epidemiological approaches, and demonstrates both of these methods of analysis in a comprehensive evaluation of tonometry using real data from recent clinical investigations.

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

The vision of 190 eyes of 130 patients with corneal scars was tested wish contact lenses, of which 166 eyes subsequently were fitted with contact lenses. Over 75% of all eyes with cortical scars showed a visual acuity improvement to 6/12 or better. All eyes with a nebular or macular cornealscar and an initial visual acuity of 6/60 or better improved to 6/12 or better. The visual acuity of 77% of the eyes fitted with contact lenses, compared to the visual acuity of 36% of the same eyes obtained with spectacle lenses, improved to 6/12 or better.

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

Corneal exposures were made on 100 eyes of anestbetized rhesus monkeys with a continuous wave HeCd ultraviolet laser at a wavelength of 325 nm. The EDso corneal damage probability point was determined to be 0.8 joules of energy. This is higher than the levels for damage reported for noncoherent ultraviolet sources. However, the endpoint used here was a well-defined circumscribed lesion as contrasted to the appearance of granules used for the broad band, wide-beam, noncoherent studies. The granules were not seen with the narrow band, small beam laser irradiation. Exposures made with 6.5 joules of energy produced lens damage, i.e., cataracts. This represents permanent damage as compared to the corncal damage which at threshold levels is completely reversible in 24–48 hours.

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

The present experiment investigated the possibility that variation in fundus pigmentation among individuals may be related to differential color sensitivity. Fifty black and white observers representinga wide range of skin (and fundus) pigmentation made direct beterochromatic brightness matches for a white standard field against each of five chromathic comparison fields. Results indicated that pigment (i.e., racial) differences in color vision do not exist, as measured by the two psychophysical methods used. The data showed that the heterochromatic matches were less reliable for the more saturated colors, violet and red, and also that the psychophysical methods used to obtain the matching data differentially influenced the results for the more saturated colors.

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

A case report of incipient juvenile glaucoma is presented. Clinical data obtained during the optometric examination indicating possible glaucoma were confirmed by an ophthalmological evaluation. Early detection of glaucoma in the young adult may help prevent significant visual impairment and disability in his later years. Screening patients of all ages for glaucoma is recommended.

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

Clinical estimates of ocular blood flow, based on a comparison of systemic blood pressure and intrancular pressure, appear to be better predictors of glaucomatous visual field loss than are tonometric estimates alone. One index of ocular hemodynamic status is the blood pressure/ intraocular pressure ratio (BP/IOP). A nomogram is presented to aid in calculating this index.

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID