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March 2001

Fresnel Prism Update

Arch Ophthalmol. 2001;119(3):458-459. doi:

After a hiatus of 23 years, one of us (A.M.) recalculated the table we devised as a fitting methodology for Fresnel prisms1 (Figure 1). These prisms come in fixed amounts, yet clinicians generally require accurate vertical numbers and flexible horizontal corrections. This table was devised in an attempt to be vertically precise with obliquely applied prisms. Corrections are not large, but a few represent 1 or more prism diopters.

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