Rimless Frames often show stress cracking that start at the screw holes, due to dull drills that rip the polycarbonate surface in the hole.
A simple drop of "Drillseal" into the hole when mounting the lenses will cure this problem, and no warranty replacements are needed.
Recommended by Vision Ease:
http://www.vision-ease.com/Portals/VisionEase/Specifications/LensDrillRimlessMounts.pdf
see at: ============>
http://optochemicals.com/products/info_drillseal.htm
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