Author: Anonymous

When measuring a patient’s PD, which reference points produce the least accurate reading?

When a patient has unequal segment heights in their glasses, the patient should be made aware. 

When taking a binocular near PD with a ruler, at what distance must the optician be from the patient in order to get an accurate reading? 

Determine the prescription of the following spherocylindrical lens, given the following lensmeter readings: Reading A = +1.75 D Reading B = 370 Reading C = +7.25 D.

Determine the prescription of the following bifocal lens given the following lensmeter readings: reading A = -7.75 + 1.75 X 045 reading B = -7.50 + 1.75 X 135 reading C = -6.50 + 1.75 X 135

What is the power of the intermediate addition for a trifocal lens given the following readings? A = -1.25 -1.00 X 135 B = -1.25 -1.00 X 045 C = +1.25 -1.00 X 045 D = pl -1.00 X 045

Given the following target positions, split the prism between the two lenses.

Match the sequential method for neutralizing the prescription of a trifocal lens.

What instrument is used for obtaining measurements pertaining to a contact lens fitting? 

What is the thickness of the lens shown?