hello everyone,
Friday I had a pt who was previously in a Physio. For his new glasses I wanted to use and Auto 2. I was curious to know if his previous pair was a physio or a physio 360. I understand the markings on both are the same. I read the thread on how to distinguish the two lenses. One of the replies talked about measuring the back curve of the lens with a lens clock. Traditional surfacing creates a spherical or toric surface and Freeform surfacing creates a aspheric or atoric back curve. Could someone please explain the diffrence to me and tell me how to use the lens clock to determine the diffrence. I read that U move the lens clock across the back of the lens, does that mean rotate the clock or what I am confused.
thanx,
jamie
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