Contrast sensitivity through hybrid diffractive, Fresnel, and refractive prisms

Optometry : Journal of the American Optometric Association
Milton Katz

Abstract

Fresnel 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 refractive prism with a diffractive element. Vistech contrast sensitivity function (CSF) Charts A, B, and C were used to measure the monocular and binocular contrast sensitivity of 21 and 20 subjects, respectively. CSF was measured without prisms (U), through the hybrid diffractive prisms, membrane Fresnel prisms, and acrylic refractive prisms in powers of 20delta, 30delta, and 40delta. Repeated measures analysis of variance calculations resulted in significant main effects in contrast sensitivity across prism types, prism powers, and between monocular and binocular measurements. Results of the Scheffé test for all possible contrast sensitivity comparisons between spatial frequencies are provided. It was found that as prism power increased from 20delta to 40delta, the rate of reduction in area under the CSF curve of ComPrisms became half that of the refractive and Fresnel prisms. Alt...Continue Reading

References

Jan 1, 1990·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·S Pardhan, J Gilchrist
Jan 1, 1986·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·G C WooB Ing
Jan 1, 1995·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·J Rabin
Sep 18, 2004·Optometry : Journal of the American Optometric Association·Milton Katz

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Citations

Aug 14, 2012·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Nicole C RossEli Peli
Feb 28, 2006·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Cornelis A VerezenB Jeroen Klevering
Aug 28, 2014·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Andrew M Haun, Eli Peli
Mar 19, 2015·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Jieming ShenAlex R Bowers
Sep 1, 2018·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Jae-Hyun Jung, Eli Peli
Sep 1, 2018·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Jae-Hyun Jung, Eli Peli
Feb 13, 2016·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Eli PeliJae-Hyun Jung
Oct 6, 2020·Biomedical Optics Express·Eli PeliJae-Hyun Jung
Oct 16, 2020·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Eli Peli
Oct 12, 2021·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Jae-Hyun JungEli Peli

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