question about Free form Progressive lens
Free form tech has brought types of new progressive lens. While classified by the front surface & back surface design of the lens, mainly three types:
1. Internal progressive: sphere on the front & progressive on the back
Seiko, Shamir's autograph, Indo, sola one &????
2. Front surface progressive & aspheric/atoric on the back surface
Rodenstock' multigressive Ilt, Zeiss Individual & Physio 360 of Essilor?
3. Double sided progressive:
only one type that is Hoyalux Id
Am I right about the classification? Is there any other types to add?
What about Essilor's ipseo?
Thanks in advance for any answer.
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