Bi-Part Double Fresnel Prism (IMAGE)

Mass Eye and Ear

Bi-Part Double Fresnel Prism

Caption

To increase the power of the peripheral prism, the bi-part double Fresnel prism combines two prism segments angled to each other. This design allows for up to 43 degrees of expansion to the visual field on the patient's blind side and an increase to 14 degrees scanning range into the blind side.

Credit

Massachusetts Eye and Ear

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