The lens.

The subjects to be reviewed are as follows: (1) Anatomy, histology, and pathology. (2) Genetic and congenital anomalies. (3) Cataract. (Under cataract we shall consider the following: incidence and prevention of blindness from cataract; formation of an experimental production of cataract; cataract related to ocular and systemic disease; cataract related to medication, trauma, and radiation; medical treatment of cataract; cataract surgery; complications of cataract surgery; optical correction of aphakia.) (4) Exfoliation syndrome.