Joined: Mar 2013
Posts: 188
pupil distance
9/1/2016 at 8:42 PM
Personally I wouldn't recommend using a ruler unless you are measuring for reading glasses.
your pupil distance will change based on the distance you are focusing on. when you are focusing on something close, they will be closer together than if you are focusing on something far away.
What i would suggest is taking an old pair of glasses that is junk, put it on and focus on a item about 20ft away. put a marker up in front of the glasses and make a mark on each lense right on the item you are focusing on. ensure when you are focusing on that item both dots merge into one. take glasses off and measure distance.
this process worked for me. however i don't really know if the small difference in measurement from 2ft away vs 20+ft is going to be noticeable or even make a difference. I just feel in case it does, I felt I wanted to be more accurate.