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Results for “Optics and Refraction”

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At least 1,099 records · Page 61Linked to original sources
PubMed1986

The spectacle magnification of focal telescopes.

A generalized expression for spectacle magnification is derived and used to determine the magnification of focal telescopes used to correct ametropia and/or to view objects at finite distances. When applied to low-powered hand-held telescopes, the expression predicts a clinically negligible difference between spectacle and nominal magnification.

Eyeglasses↗
PubMed1985

Fresnel prism correction for trauma-induced diplopia.

Fresnel prisms placed on the spectacle lenses of a patient with optic atrophy resulting from an accident eliminated constant diplopia in the remaining visual field. A reduction in vision due to Fresnel prisms was found to be more tolerable than diplopia.

Diplopia↗
PubMed1985

Prism-induced horopter distortions.

The effects that lateral prisms have on the horopter were evaluated in 11 subjects, including 6 subjects classified as binocularly abnormal. For normal subjects with good stereopsis the equidistance (stereoscopic distance matching) horopter shape was altered with the application of lateral prism. For other subjects this was not the case. Equidirection (nonius) horopters were unchanged by the application of lateral prism in all of the subjects tested. In addition to localized irregularities in the horopter locus, shifts in fixation disparity produced regional distortions of the horopter.

Depth Perception↗
PubMed1979

Clinical evaluation of FDA approved toric hydrophilic soft contact lenses (Part I).

Three toric hydrogel contact lenses have been approved by the FDA, Durasoft TT, Hydromarc, and Hydrocurve II. These all incorporate prism ballast as the major axis stabilizing feature, but differ in diameter and placement of the cylinder. Correct cylinder axis positioning and maintenance of meridional stability are essential to fitting success.

Astigmatism↗