Hi there,
I have a prescription around sph -2.50 cyl -1.50 x 105 . I just bought
new polycarbonate rimless glasses with rectangular lenses. Material was
essilor crizal alize 1.59 .

I was a bit disappointed in seeing the thickness of the lenses.
Measuring thickness at the centre of the bottom edge of the lens
measures 2mm, while on the center of the side they measure 4mm (this is
about 3cm distant from the pupils).

My cyl axis is almost vertical, I think this means that the 2mm I am
measuring in the bottom edge should be equal to the central thickness of
the lens (which is not easily accessible without a particular caliper).
This seems a lot to me.

In the position where they had to put the screw nut at the side they had
to partially pierce the lens so that the nut could enter a bit into the
lens (while still staying a bit out of it so that it can be turned),
otherwise the screw at the opposite side would have been too short
(these were sunglasses frames). I might not be able to put my next
lenses there!? Does anybody make longer nuts so that these can enter
like 2mm into the lens and stay 1mm out of it?

A friend of mine has a prescription similar to mine and has very thin
rimless glasses... how can that be? Are there lenses for rimless which
can be thinner than polycarbonate?

Is 2mm central thickness normal? My lenses appear very resistant, I
don't need such a high resistance. Choosing crizal alize I thought I was
choosing something near the top of the line, I am surprised that they
have such a big central thickness.

Thanks for your comments