A clear lens standing on a dark surface, lit by a single narrow beam of warm light that crosses it and catches its polished rim.

Verify a CLIFF certificate

Enter the serial number printed on your CLIFF certificate to confirm the lens it was issued for.

Printed on your certificate, like CLF-4021-8830.

A brass loupe lying open beside a pair of thin metal frames on a dark leather counter, lit from the left.
CLF

Every stock lens and every progressive lens is engraved during manufacture with the CLIFF mark, and every made-to-order pair is issued with a numbered certificate. The engraving is how your optician knows the lens is ours, years later and without paperwork; the certificate number is what records which design was made for you.

A disc of clear optical glass standing on edge on dark stone, a beam of warm light passing through it and casting a bright oval of light beside it.