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Interference based marking method for toric contact eye lens inserts

Toric contact eye lenses are designed to address general blurring that occurs due to uneven cornea which is known as astigmatism. For proper functioning of toric lenses their orientation with respect to the eye is critical. So toric lenses are manufactured with some form of marking which helps in deciding the orientation with respect to the eye. In this research paper a novel marking method based on the interference principle is proposed for toric lenses. Mathematical modeling followed by experiments was done to prove the concept of interference based marking. The proposed marking method is a mask-less, single step clean process.