FIELD: optics.
SUBSTANCE: ophthalmic lens, which contains the usability indicator that specifies, when the lens should be ejected. Usability indicator comprises the material that is transparent, when the lens is removed from the package, and which passes into the visible marking after the predetermined period of time in accordance with the time of use, which is proposed by the manufacturer. Material is compatible with the lens material and does not interfere with the optical functions.
EFFECT: technical result is in prevention of the lens wearing beyond the time periods, which are indicated for their replacement.
14 cl, 18 dwg
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