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Biomedical subjects

H W Hofstetter

Publications and source records attributed to H W Hofstetter.

At least 19 recordsLinked to original sources
PubMed2001

Reliability of rotary prism fusional vergence ranges.

BACKGROUND: The measurement of fusional vergence ranges is an important clinical test in the assessment of binocular vision status. Fusional vergence ranges are typically measured by recording a patient's reports of blur, break, and recovery to base-in (BI) and base-out (BO) prism. Published reliability data on fusional vergence ranges are very limited. METHODS: Eight subjects underwent four testing sessions, at which repeated measurements of fusional vergence ranges were taken. Near ranges were tested at the first session only Distance ranges were tested at all four sessions. Intra-examiner standard deviations were calculated for each fusional vergence test result (BI and BO; blur, break, and recovery) for each session. Intra-examiner standard deviations were averaged. These values were used to determine 95% limits of agreement. RESULTS: The 95% limits of agreement were between 2 delta and 2.5 delta for the distance BI break and recovery and for the near BI recovery; between 3 and 4 delta for near BI break and near BO break; between 4 and 5 delta for distance BO blur and recovery and for near BI blur; and between 5 and 5.5 delta for distance BO break and near BO blur and recovery.

Adult↗
PubMed1988

Optometry of Daza de Valdes (1591-ca. 1636)

The 1623 Spanish book entitled Uso de los Antoios by Benito Daza de Valdes has been translated into English and is presently available in manuscript form at the International Library, Archives, and Museum of Optometry. The first of its three parts deals with the nature and properties of the eye and its refractive conditions. The second discusses contemporary spectacle lenses and frames in technological and utilitarian detail. The third and major part in the style of Platonian dialogue describes a variety of clinical optometric problems and their practical solutions. The procedural similarities to today's mode of optometric analysis is remarkably evident.

History, 17th Century↗
PubMed1986

Bifocal adds and environmental temperature.

Eight hundred and eighty-eight optometrists of North and Central America were asked to provide data on their typical bifocal addition (add) for 45-, 50-, 55-, and 60-year-old males and females. Analysis of the 577 responses shows no significant difference of adds with the mean annual temperatures of the optometrists' communities at any of the four age levels. The mean annual temperatures in the survey ranged from -7 degrees Centigrade (19 degrees Fahrenheit) in Alaska to 26 degrees Centigrade (79 degrees Fahrenheit) in Puerto Rico. Previously reported inverse correlations are explained in terms of a self-selection bias by patients at the earlier presbyopic age levels when age of onset criteria are used instead of more advanced presbyopic age levels when all persons seek ophthalmic services. The mean adds for females at all four age levels were between 0.05 and 0.06 D higher than for males, theoretically attributable to differences of physical stature rather than of age of onset or advancement of presbyopia.

Accommodation, Ocular↗
PubMed1981

New standards procedures for measuring visual acuity.

Portions of the Committee on Vision Working Group 39 report relevant to optometry practice are reproduced here along with supplementary comments. The report presents standards for test conditions, procedures, and criteria that will enable different examiners to obtain the same results when measuring visual acuity. The Landolt C ring is recommended as the primary standard optotype; other optotypes may be used if they are shown to yield comparable results. Adoption of metric measurements is suggested for both distance and near acuity.

Humans↗
PubMed1978

[Fissure sealing combined with enamel fluoridation. Follow-up study 2 year after sealing].

In a two-year study the adhesion of diluted composite material as fissure sealant was tested upon etched and etched-fluoridated (aminofluoride) occlusal surfaces of molars and premolars. After 24 months the sealant was found to be intact in 89.3% of the only etched and in 85.6% of the etched-fluoridated fissures. 3.9% of all sealed fissures showed either an increase in the degree of caries or a filling, while the control teeth showed a percentage of 49.7 DF. Fissure sealing therefore appears to be an adequate method for reducing occlusal caries.

Adolescent↗
PubMed1978

Prentice in Lahr and Karlsruhe.

Charles F. Prentice's father was born in England and his mother in Germany. Charles' boyhood days were spent chiefly on Staten Island, New York. At age 16 he attended "Gymnasium" in Lahr, Germany. his mother's ancestral hometonw. During the three subsequent years he studied mechanical engineering at the institute now known as the University of Karlsruhe, West Germany. Illustrations include scenes in Karlsruhe and Lahr and transcripts of his academic records.

Germany↗
PubMed1977

Charles F. Prentice Memorial Lecture--1976. Optometry curriculum patterns in Europe.

The education and training of optometrists--more appropriately, ophthalmic opticians--in the western countries of the European continent differ in content and amount from that found in English-speaking countries, particularly the U. S. Current curriculum patterns for 12 European countries are presented. Formalized basic education before professional training averages 9.4 academic years; formalized course work, identified with curricula of schools of optics and optometry, averages 2.8 academic years; and required apprenticeship time averages about 2 years.

Curriculum↗
PubMed1976

Does stereopsis change with age?

Stereopsis thresholds were measured on 242 subjects with normal visual acuity and ranging in age from 8 to 46 years. The results showed no trend with age and no significant sex difference. The log-second threshold mean was 0.74+/-0.21 with a test-retest reliability coefficient of 0.70+/-0.05.

Adolescent↗
PubMed1976

Visual acuity and highway accidents.

An analysis of binocularly obtained visual acuity test scores of 13,786 automobile drivers was made in terms of the number of accidents reported by each driver during a 12 month period. For each of eight different age categories the drivers were classified as having poor acuity if their scores were below the lower quartile, and as having good acuity if their scores were above the median. The percent of drivers with poor acuity who reported three or more accidents was approximately double the percent of drivers with good acuity who reported three or more accidents. The proportion with poor acuity who reported two accidents was approximately 50% greater than the proportion for those with good acuity. These differences were statistically significant and prevailed at all age levels above 19 years. The differences in proportions reporting one accident and no accident for the poor and good acuity categories were not significant.

Accidents, Traffic↗