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 carrier
central field
centration distance CD
Centration error of the instrument
centration point CP
clear lens
coated lens
combination frame
concave lens
Condensing lens
Continuously-indicating focimeter
contrast
converging lens
convex lens
corneal plane
Corneal Refraction
corrective lens
curved-form lens
curved-top bifocal
curved-top segment
cylinder
cylinder axis
cylindrical lens
cylindrical power
cylindrical surface
Cylindrical test lenses
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