Results 141 to 150 of about 785 (184)

An Evaluation of the Use of Fresnel Press-on Prisms in Childhood Strabismus

American Orthoptic Journal, 1975
Sally Moore
exaly   +3 more sources

Fresnel Prism Therapy for Right Hemianopia

American journal of optometry and physiological optic, 1983
ABSTRACT Fresnel prisms placed on the spectacle lenses of a patient with right hemianopia provide an easier means for the patient to become aware of objects located in the blind field. Exact location of the prisms is important.
G C, Woo, T, Mandelman
openaire   +2 more sources

FRESNEL PRISM CORRECTION FOR TRAUMA‐INDUCED DIPLOPIA

Ophthalmic and Physiological Optics, 1985
Abstract— 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.
G C, Woo, J V, Lovasik
openaire   +3 more sources

Fresnel Prism Use Among Orthoptists

American Orthoptic Journal, 2014
To better understand current uses of Fresnel prisms.A seventeen-question survey was completed by members of the American Association of Certified Orthoptists (AACO).Surveys were emailed to 211 orthoptists with a 36% response rate (n = 76). Prisms are used preoperatively to determine the surgical angle for 72% of respondents, 94% use prisms for ...
Terra, Haller, Bruce A, Furr
openaire   +2 more sources

Hard x-ray Fresnel prisms: properties and applications [PDF]

, 2004
J M Ablett, K Evans-Lutterodt, Aaron Stein   +2 more
exaly   +2 more sources

The fresnel prism as polarization interferometer

Microwave and Optical Technology Letters, 1993
AbstractHere we show that a Fresnel prism can be used as a polarization interferometer. A linearly polarized beam, which is incident in this interferometer, is split into two circularly polarized beams, one right and another left, which generate the interference pattern. Interposing a solution of common sugar in the incident beam, the former pattern is
openaire   +1 more source

EFFECT OF FRESNEL PRISM DISPERSION ON CONTRAST SENSITIVITY FUNCTION*

Ophthalmic and Physiological Optics, 1986
Abstract— Fresnel prisms are often used in orthoptics for binocular anomalies and in low vision for visual field defects. These prisms are made of optical polyvinyl chloride (PVC) and this material increases chromatic dispersion and produces a loss of contrast.
G C, Woo, F W, Campbell, B, Ing
openaire   +2 more sources

The Amorphic Fresnel Prism Trioptical System

1987
Severe visual field constriction, characteristic of conditions such as retinitis pigmentosa and end stage glaucoma creates significant limitations on an individual’s mobility and activities of daily living. In such cases, reverse telescopic systems have been utilized in an attempt to expand the visual field [1,2]. These image minification systems focus
Richard L. Brilliant, Sarah D. Appel, Robert J. Ruggiero   +2 more
openaire   +1 more source

Fresnel vs. Conventional Prisms

American journal of optometry and physiological optic, 1988
ABSTRACT Among the inherent optical aberrations found in conventional crown glass or resin prisms is the property known as nonuniform relative magnification. Prisms, by definition, displace an image by a given amount. However, the final size of the image is nonuniform, being relatively larger toward the apex than toward the base of ...
S M, Brunnett, M T, Munson, D G, Kirschen   +2 more
openaire   +2 more sources

A FRESNEL PRISM BAR FOR HOME VISUAL THERAPY

Optometry and Vision Science, 1974
ABSTRACT Fabrication of an inexpensive, easy‐to‐use prism bar using Fresnel Press‐on TM prisms is discussed.
openaire   +2 more sources