EDGE ELEMENTS OF LENS FOR DETERMINATION OF ARRANGEMENT AND ALIGNMENT OF LENS Russian patent published in 2020 - IPC G02C7/04 

FIELD: medical equipment.

SUBSTANCE: contact lens comprises a lens edge, an optical zone configured to correct vision, a lens center and first and second marker indicators in a first and a second different location along said edge of the lens. In first version, first marker indicator comprises first recess, second marker indicator comprises second and third recesses, located substantially adjacent to each other. In the second version, the lens comprises a first recess in the lens edge in a first location, and a double slot, comprising adjacent second and third recesses in lens edge at second location along said lens edge, which is different from first location.

EFFECT: technical result is evaluation of adjustment and verification of correct position of lens before placing it on eye.

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