Soft contact lens with contamination indicator

摘要

A soft contact lens contamination warning means, comprising openings through the lens material which are dimensioned to be invisible to the wearer but allow wastes to flow from the posterior to the exterior surface of the lens without critically distorting the lens optical section or interrupting the visual continuity of the lens flange section. The dimensions of the openings are designed so that when waste materials accrete on their inner surfaces or walls, they expand due to the accumulated accreted waste to a point where they interrupt the visual continuity of the lens and becomes visible to the wearer, alerting the wearer of the need to change or discard lenses.