摘要:

This paper describes how information about the configuration of the cornea can be derived from the raw data obtained with telecentric photokeratometers, and how such data can be expressed and used. It also deals with the interrelations of the different ways of expressing the data.

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

To determine if there are corneal curvature and refractive error changes associated with hydrogel lens wear, 27 patients wearing F series Bausch & Lomb SOFLENSTMcontact lenses were examined regularly for nine months.During the first month of lens wear, a mean corneal steepening of 0.23 DK \Pm 0.18 and an increase in with-the-rule toricity were found, which persisted during the following eight months of wear.A mean increase in myopia of 0.35 DS \Pm 0.211 DS was found after nine months of lens wear for five randomly selected patients. This amount of change was statistically significant and was highly correlated with the observed corneal steepening.Their lenses were removed after nine months of lens wear. Both corneal changes and the increase in myopia persisted during the 14 days after lens removal. If long term studies with larger samples show similar results, the effect of bydrogel lenses on corneal curvature and refractive error will have to be considered in the decision to fit this type of lens.

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

In recent years it has become common for the birefringence pattern of a thermally toughened glass lens to be examined, and for a judgmental opinion of the impact resistance of that lens to be based on the regularity of the observed pattern Laboratory experiments were carried out to determine the validity of this practice.Commercially available and specially-generated lenses were subjected to modified heat treatments in the laboratory. The birefringence patterns were then examined and the impact resistances determined: these were then compared with those of control groups, tested simultaneously.In these experiments there was no correlation between impact resistance and regularity of birefringence pattern. Reliance on such a correlation for assessing strength is therefore thought to be unjustified and, in some cases, even dangerous. Replication of this work by others is suggested.

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

Employing a laser refraction technique, spherical error was determined for each of three meridians in 50 eyes. The measurements were used to calculate spherical error and cylindrical axis and power, and the findings were compared with standard methods of measurement. Correlation between the laser and non-laser methods indicated that the laser technique is a valid method for determining spherical error. Correlation between the findings for laser and non-laser cylindrical measurements were not high enough to warrant use of this laser technique in clinical practice. Differential laser validity findings for against-the-rule astigmatism are also discussed.

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

It is often recommended that children be screened for possible color vision deficiencies as early as possible. This paper examines the validity of commercially available color vision tests when used with young children (age three to seven years). It is concluded that with the possible exception of the anomaloscope, no test is entirely suited for children, in most cases because the test makes cognitive demands beyond the capability of the young child.

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

The Titmus Pediatric Color Perception Test was compared to three other standard tests of color vision (Ishihara, Dvorine, Farnsworth D-15) with a population of adults: It is concluded that the results of the Titmus test are consistent with those of the other tests if certain specific scoring methods, described in the text, are used.

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

An interdisciplinary approach to licensing partially-sighted individuals to drive is presented. The model includes the participation of optometry, special education, and the department of motor vehicles.

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

A new instrument has been developed for utilization in attempts at myopia therapy and control. The inventor discusses instrument design and treatment procedures, and suggests an explanation for the movement of juvenile eyes from hypermetropia into myopia.

ISSN:0093-7002    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

The current nationwide attack on hypertension, with its emphasis on early detection and prevention, has served to reinforce optometry's commitment to vision-related health screening and referral. The current status of this multidisciplinary program is reviewed, and the major risk factors are presented, in a hypertension screening/referral form designed to improve the screening/referral process.

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