Hit and miss, mostly miss

Coming from another optician, use this app at your own risk. If the picture is straight, the card nice and level, and you are extremely careful with positioning the box and crosses, then it might be safe to use if you have a low prescription and only wear single vision. I would not use if you wear progressive lenses!!! See a professional for sure. Your vision is too important!

Jmansuy about Pupil Meter