Population studies--myopia experience in Japan.

From Japanese population studies the following is summarized: 1) The refractive condition in each person is mainly determined by the axial length. 2) The axial length of the eye depends mainly on the length of vitreous cavity. 3) The anterior part of the eye, that is from the corneal surface to the posterior surface of the lens, may differ from individual to individual. 4) However, the differences found are rather small, and anterior segment axial distances do not play an important role regarding refractive value.