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Results for “Hyperopia”

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At least 1,657 records · Page 92Linked to original sources
PubMed1976

A vision profile of American Indian children.

In an unselected study, Modified Clinical Technique screening plus keratometry was done on 398 American Indian grade school children. The results are compared to screening results for Caucasin grade school children.

Astigmatism↗
PubMed1976

Vision analysis and refractive status of youths in a juvenile detention home population.

Clinical optometric findings of 633 juvenile dentention youths were statistically evaluated and compared to data from the general population. The youths had a higher referral rate of refractive errors, organic problems, and muscle in balances than the general population. Female youths exhibited a higher incidence and greater severity of myopia than males at all ages. Referral rate for astigmatism among the youths was higher than the general population although the dioptric power was in agreement with previous studies.

Adolescent↗
PubMed1977

Refractive error distribution in a profoundly retarded population.

The refractive errors distribution of 103 profoundly retarded individuals (10 of zero to 20) was determined. This distribution was skewed in the direction of myopia. Since no such data were available for any other profoundly retarded population, direct comparison with other studies was not possible. However, a significant difference in mean spherical equivalent was found between the profoundly retarded of this study and the combined severely and profoundly retarded of two earlier studies.

Adolescent↗
PubMed1979

A statistical analysis of the Biological Theory of spherical error of refraction.

It is widely believed that Adolph Steiger proved in Die Entstehung der sphärischen Refraktionen des menschlichen Auges (The Origin of Spherical Refractions of the Human Eye) that the Biological Theory of spherical error of refraction statistically explains the entire distribution of such errors, hence excluding other theories such as the Use-Abuse Theory. Although Steiger's Biological Theory is a statistical argument, he never put it into formal notation. This paper puts a modernized version of the Biological Theory into formal statistical notation. It shows that the Biological Theory explains the dispersion of distributions of spherical error of refraction but not the location of their means. The Use-Abuse Theory is an explanation of mean spherical error in populations. Since a complete theory of spherical errors of refraction needs to explain both the mean and the dispersion of their distribution, the two theories are potentially complementary. No empirical evidence, however, is presented here for either theory.

Eye↗
PubMed1979

Refractive state of the eye of a small diurnal mammal: the ground squirrel.

Previous work dealing with the question of whether or not the eyes of small mammals are hyperopic has been restricted largely to the study of nocturnal animals such as the rat. In this study, refractive state of the eye of a small diurnal mammal, the ground squirrel, was measured by retinoscopy and from the electrophysiological response of retinal ganglion cells to grating targets. Both measurements show the squirrel to be emmetropic. We conclude that the refractive state of the eye is not a function of eye size per se, but rather a function of whether the animal is nocturnal or diurnal.

Activity Cycles↗