Abstract
References
1.
Choyce
D P
(1952 ) Brit. J. Ophthal.
36 , 123 .
2.
Cutler
N J
(1947 ) Arch. Ophthal., Chicago.
32 , 253 .
3.
Hudson
J R
(1950 ) Brit. J. Ophthal.
34 , 251 .