Useful and well done, but i don't agree with the amount of prism diopter, maybe confused with the same amount of degree? Pupil margin 15° = about 30DP; Middle Iris 30° = about 60DP Libus 45° = about 90DP
In approximate deviation the values should be 15, 30 and 45 degrees which you have told in Prism diopters. In Prism diopters the values should be 30, 60 and 90 Prism Diopters. Kindly recheck.
You are wrong in your explaination. Deviation measures in degree which than covert into pd …at pupillary margin it is about 15degree that is about 30 pd approx .