Results 121 to 130 of about 1,326 (153)
Some of the next articles are maybe not open access.
Visual performance and optical properties of Fresnel membrane prisms.
American journal of optometry and archives of American Academy of Optometry, 1971The Fresnel prism, an outgrowth of the early nineteenth century lenses designed for lightâhouses by Augustin J. Fresnel, can be imagined as a series of small prisms lying adjacent to each other on a thin transparent platform.
A J, Adams, R J, Kapash, E, Barkan
openaire +3 more sources
Fresnel membrane prisms: clinical experience.
Canadian journal of ophthalmology. Journal canadien d'ophtalmologie, 2000There are few published reports on the clinical application of Fresnel membrane prisms in the treatment of diplopia in adults. The authors describe the use of these prisms in patients with fourth and sixth cranial nerve palsies, restrictive motility caused by thyroid-related orbital disease, and convergence insufficiency.Of 209 patients who had been ...
M, Flanders, N, Sarkis
openaire +1 more source
A Fresnel bi-prism device for atomic matter waves
Optics Communications, 1997Abstract The principle of a simple bi-prism for coherent atomic translational waves is studied. The scheme of the experiment consists of a diffracting slit, in front of which the evanescent wave running along a tapered optical fibre provides a converging gradient of optical potential for two-level atoms.
R. Brouri +6 more
openaire +1 more source
The effectivity of Fresnel prisms for visual field enhancement.
Journal of the American Optometric Association, 1993An objective method for placement of Fresnel prisms has been used to enhance constricted visual fields at the Eastern Blind Rehabilitation Center in West Haven, CT since 1975. To study the effectiveness of this method, 22 patients fitted with prisms since 1986 participated in a survey regarding their level of satisfaction with the prisms.
E, Hoppe, R R, Perlin
openaire +1 more source
Contrast sensitivity through hybrid diffractive, Fresnel, and refractive prisms
Optometry - Journal of the American Optometric Association, 2004Fresnel and wedge-shaped refractive prisms are used diagnostically and therapeutically in clinical practice. This article extends the study on the effect of prisms on visual acuity to the effect on contrast sensitivity by membrane Fresnel (F), refractive (R), and newly designed hybrid diffractive (C) prisms (ComPrisms), which combine a wedge-shaped ...
openaire +2 more sources
Polarization Conserving Light Bending Prisms and Optimized Fresnel Rhombs
Applied Optics, 1974The design of prisms utilizing total internal reflection to achieve particular phase retardation is considered. Two prisms are discussed that bend light by 90 degrees without changing its polarization. Optimum design for Fresnel rhombs is considered, and designs for quarter-wave and half-wave are presented. The effect of light beam divergence and prism
openaire +2 more sources
[Fresnel prisms--their value in the rehabilitation of homonymous hemianopsias].
Klinische Monatsblatter fur Augenheilkunde, 1988The use of press-on Fresnel prisms is described as a simple inexpensive technique to rehabilitate patients with homonymous hemianopsia. The optical principle of prismatic displacement from the blind to the seeing fields is detailed herein. Forty-one patients were evaluated over a 10 year period. Twenty per cent benefited from the prism.
T R, Hedges, J, Stunkard, A, Twer
openaire +1 more source
Management of patients with small-angle esotropia and subnormal stereopsis using Fresnel prism
Graefe's Archive for Clinical and Experimental Ophthalmology, 2021Haeng-Jin Lee +2 more
exaly
Fresnel prisms and their effects on visual acuity and binocularity.
Transactions of the American Ophthalmological Society, 19791. The visual acuity with the Fresnel membrane prism is significantly less than that with the conventional prism of the same power for all prism powers from 12 delta through 30 delata at distance and from 15 delta through 30 delta at near. 2. The difference in the visual acuity between base up and base down, and between base in and base out, is not ...
openaire +1 more source