Works fine. 1 star people pay attention

I read reviews and almost didnt purchase but figured people were doing it wrong.....yep! They were. It works. TIP! Take about 10 measurements. Once you can get 3-4 to match you are doing it right. I was all over the place till I realized you have to keep head level looking straight and Credit card must go below nose. It works fine. Got 57.1mm PD 3 times in a row exactly so it is a precise measuring tool.

Farmer DM about Pupil Meter