Despite the hundreds of reported cases, great uncertainty still remains as to the exact optical effect produced by removing the clear crystalline lens from a highly myopic eye. The great mass of these cases are so reported as not to throw any definite light on the optical questions involved. To point out what is our present knowledge of the subject, and to urge the reporting of more exact data regarding future cases are the purposes of this paper.
Myopia due to Excessive Corneal Curvature.
—If a high myopia were due solely to excessive curvature of the cornea—the anteroposterior length of the eyeball and the refractive power of the lens being no greater than in the average emmetropic eye—the removal of the crystalline lens would cause substantially the same optical effect as it would in the emmetropic eye; that is, about 11 D. of change as measured at the cornea; or