No Useful Field Expansion with Full-field Prisms

Optometry and Vision Science : Official Publication of the American Academy of Optometry
Jae-Hyun Jung, Eli Peli

Abstract

Full-field prisms that fill the entire spectacle eye wire have been considered as field expansion devices for homonymous hemianopia (HH) and acquired monocular vision (AMV). Although the full-field prism is used for addressing binocular dysfunction and for prism adaptation training after brain injury as treatment for spatial hemineglect, we show that the full-field prism for field expansion does not effectively expand the visual field in either HH or AMV. Full-field prisms may shift a portion of the blind side to the residual seeing side. However, foveal fixation on an object of interest through a full-field prism requires head and/or eye rotation away from the blind side, thus negating the shift of the field toward the blind side. We fit meniscus and flat full-field 7Δ and 12Δ yoked prisms and conducted Goldmann perimetry in HH and AMV. We compared the perimetry results with ray tracing calculations. The rated prism power was in effect at the primary position of gaze for all prisms, and the meniscus prisms maintained almost constant power at all eccentricities. To fixate on the perimetry target, the subjects needed to turn their head and/or eyes away from the blind side, which negated the field shift into the blind side. In HH...Continue Reading

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Feb 13, 2016·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Eli PeliJae-Hyun Jung
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Jul 21, 2017·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Eli Peli, Jae-Hyun Jung
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

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Citations

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
Sep 1, 2018·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Bradley Dougherty
Oct 6, 2020·Biomedical Optics Express·Eli PeliJae-Hyun Jung
Aug 29, 2020·Translational Vision Science & Technology·Jae-Hyun JungEli Peli
Oct 16, 2020·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Eli Peli

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