A trio of eyeglasses using revolutionary prism techniques could open up a whole new field of view for patients with hemianopia. The three designs – yoked prisms in a carrier lens, a bi-part double Fresnel prism, and the mirror-based periscopic prisms – were showcased in the journal Optometry and Vision Science. Lead researcher and Harvard Medical School ophthalmology professor, Dr Eli Peli, told OT that current eyeglasses – including the commercially available spectacles released by his research team in 2013 – allowed patients with hemianopia to expand their visual field from its restricted 90 degrees to a maximum of 120 degrees.
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