What Is The Maximum Amount Of Prism In Glasses?
What Is The Maximum Amount Of Prism In Glasses? Few patients tolerate Fresnel prisms greater than 15 prism diopters (PD) because of blur. An optical shop can fit a ground-in prism up to 8 PD into each lens of the glasses, but with these strongest prisms, one edge of the lens may become 1⁄4” thick