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Precise surface cutting using single point turning; cutting height is controlled at all points on the lens.

Complete color deficiency affecting the ability to see the color green. There are three possible color vision deficits: red (protan), green (deutan), and blue (tritan). The suffixes ?omaly and ?opia indicate partial and complete color vision deficits, respectively. Therefore, a person who has deuteranopia has a complete green color deficit.

A layer of the cornea which lies just forward of the endothelium.