Measuring IPD- Viktorins method

Question 1

How to measure IPD?

Answer 1

When measuring IPD close your RE and ask pt to look at your finger then and measure outer limbus from 10mm. Then close LE and tell them to look at finger and measure from the inner limbus.

Question 2

Getting the measurement

Answer 2

Starting position with subject looking at my Left eye whilst I have my Right eye closed. Line up the 1 of the ruler (10mm) with the outer (temporal) limbus of the subject’s Right eye.
Now to measure, the subject looks at my Right eye whilst I have my left eye closed and I take the measurement on the ruler of the position of the inner (medial) limbus. (73mm)

(Note the position of the outer limbus of the Right eye, no longer at 10mm.)- example

The measurement is 73 – 10 = 63mm

Question 3

Normal IPD measurement

Answer 3

The normal range is between 50-70.

Question 4

Mono IPD

Answer 4

distance between each eye and bridge of nose

Question 5

Mono OC

Answer 5

distance from centre line to optical centre