Ophthalmic prisms are used for correcting many ocular conditions such as strabismus, diplopia (double vision), hemianopia and visual spatial neglect.
For prism powers of more than 12PD, flexible membrane press-on Fresnel prisms are commonly used but they offer poor optical quality for prism powers of 15PD or more1.
Paltz Associates, Inc. offers practical alternatives to press-on Fresnel prisms with better optical quality.
For low prism powers:
An alternative to Fresnel press-on prisms. Precision molded to reduce multiple images, image washout and scattering.
10 - 40 PD, 57 PD
For high prism powers:
Corrects for factors that introduce aberrations in high power prisms. Improves optical quality and contrast sensitivity.
25 PD or greater.
Rigid Fresnel Prisms and ComPrisms® are available in the following forms:
Prism Training Goggles
For diagnostic purposes.
Clip on to matching spectacle frame.
Clip on to spectacles; flip up when not needed.
Used for vision training.