Results 111 to 120 of about 1,326 (153)
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EFFECT OF FRESNEL PRISM DISPERSION ON CONTRAST SENSITIVITY FUNCTION*
Ophthalmic and Physiological Optics, 1986Abstract— 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.
George C Woo +2 more
exaly +3 more sources
Fresnel Prism Membrane in Acquired Extraocular Muscle Palsy
American Orthoptic Journal, 1974exaly +3 more sources
Fresnel vs. Conventional Prisms
American journal of optometry and physiological optic, 1988ABSTRACT 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 +2 more
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Influence of Nonparallel Slot and Prism Ridge on Interference of Fresnel Double Prism
Laser and Optoelectronics Progress, 2019韩佩杉 Han Peishan +6 more
exaly +2 more sources
A FRESNEL PRISM BAR FOR HOME VISUAL THERAPY
Optometry and Vision Science, 1974ABSTRACT Fabrication of an inexpensive, easy‐to‐use prism bar using Fresnel Press‐on TM prisms is discussed.
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Journal of clinical neuro-ophthalmology, 1983
Patients with homonymous hemianopic visual field defects have been treated by using a 30-diopter Fresnel plastic paste-on prism on their glasses. A patient with a left homonymous hemianopia, for instance, can have a 30-diopter base left (i.e., base out) Fresnel prism placed on the temporal half of the left spectacle lens.
J L, Smith, I G, Weiner, A J, Lucero
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Patients with homonymous hemianopic visual field defects have been treated by using a 30-diopter Fresnel plastic paste-on prism on their glasses. A patient with a left homonymous hemianopia, for instance, can have a 30-diopter base left (i.e., base out) Fresnel prism placed on the temporal half of the left spectacle lens.
J L, Smith, I G, Weiner, A J, Lucero
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The Amorphic Fresnel Prism Trioptical System
1987Severe 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 +2 more
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The Therapeutic Scope of the Fresnel Press-On Prism: Three Interesting Cases
American Orthoptic Journal, 1975exaly +3 more sources
Comparison of the visual effects of Fresnel prisms in normal and amblyopic eyes
Journal of American Association for Pediatric Ophthalmology and Strabismus, 2008To assess the effects of Fresnel prisms on visual acuity and peak contrast sensitivity in the amblyopic and sound eyes of participants with amblyopia and to determine whether these functions were affected by Fresnel prisms to a different degree than those of controls.The LogMAR visual acuity and peak contrast sensitivity of 10 unilateral amblyopic ...
David, Wright +2 more
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FIR Fresnel Prism used as a Quarterwaye Plate
1976 International Conference on Submillimeter Waves and Their Applications, 1976Fresnel prisms were extensively studied and used in the optical region of the spectrum /1/. When radiation propagates in a medium towards a surface that separates the given medium from an optically less dense material, then total reflection may occur, when the angle of incidence is greater than the critical angle of the optically dense medium.
U. O. Farrukh, G. A. Koepf
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