Question

Example: the binocular PD is 66. The scale reading at the center of the nose is 32. The monocular PD for the right eye is then ____. To calculate the monocular PD for the left eye, subtract ______ from 66, to get a reading of ____.

A) 32; 32; 34
B) 34; 32; 34
C) 32; 34; 34
D) 34; 34; 32

Answer 1

The monocular PD for the right eye is 32 mm, and after subtracting this from the binocular PD of 66, the monocular PD for the left eye is 34 mm. The correct answer is A) 32; 32; 34.

Step-by-step explanation:

To calculate the monocular PD (pupillary distance) for each eye, you need to know the binocular PD and the reading at the center of the nose. In this case, the binocular PD is given as 66 and the scale reading at the center of the nose is 32.

Since the scale is centered, the monocular PD for the right eye would be the same as the reading for the center of the nose. Therefore, the monocular PD for the right eye is 32 mm. To calculate the monocular PD for the left eye, you subtract the PD of the right eye from the total binocular PD, which is 66 mm - 32 mm, resulting in a PD of 34 mm for the left eye.

So, the correct option is A) 32; 32; 34, meaning the monocular PD for the right eye is 32 mm, and after subtracting 32 from the binocular PD of 66, you get a reading of 34 mm for the left eye.