Hi everyone,

Sorry for my bad English I want improve.

I'm a student of optics and optometry, I work like "shop assistant" in an optical shop and... I learn :)

Be patient please I start my study only 6 months ago.the

I have a question...when I have to cut a lens for a patient we know that for avoid prisms on a lens I have to take the PD of the patient... the fitting height and calculate the positions of the optical center on the frame shape.

But often I see the optician (even in some books or on youtube tutorial even in English from different country ) take only the PD... the fitting height is taken only fo aspherical lenses and Pal's.

So it is so important take the correct fitting height on all lens or not?

thanks

I hope this is not boring for you guys.