1.74 Index Lens for Semi-rimless Frame
Can 1.74 index be used on semi-rimless frame?
I was told by the local provider that 1.74 cannot be used for semi-rimless frame, has to go to 1.67. is it true or not?
Well, the answer is more complicated than this...
It depends on the diopters of the lens and how big is the frame.
There is a minimum thickness that the lens must have for mounting in the semi-rimless frame.
The 1.74 index lenses are indeed thinner. If you add this to (+) diopters (they are thinner at the edges), you got an extra thin lens that you cannot mount in the semi-rimless frame.
In this case, I recommend you a smaller frame, because the lens is thicker at the center.
If your diopters are (-), then the lens is thinner at the center, so a 1.74 lens is even thinner, but get thicker at the edge, so if this is your situation, I recommend a bigger frame, this way maybe it will meet the minimum thickness.
All this if you insist having the 1.74. If this is not possible, then I think the 1.67 is not a bad option.
Hope this helps,
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