Excellent

Ignore the bad reviews of this app; those people are not using it correctly. If you use a credit card as the reference, take a half-decent picture of yourself with the front-facing camera, and remember to first measure the card using the "virtual calipers" before measuring your eyes, you will get consistent accurate results. The only thing this app cant do is provide the "split" distances as a result of asymmetry of the face. I got consistent readings of 60 to 61mm. I then went to the optometrist after deciding not to purchase glasses on-line, and the measurement they took was 29.5/31.5 (split). In other words, 61mm. Not too shabby.

futurepants about Pupil Meter