Abstract

References
1.
Brander
T.
(1940 ) Acta paediat., Uppsala , 28 , Suppl. 1 , 74 .
2.
Breakey
A. S.
(1955 ) Arch. Ophthal., Chicago , 53 , 852 .
3.
Burns
R. P.
(1959 ) Arch. Ophthal., Chicago , 61 , 376 .
4.
Castrén
J.
(1955 ) Acta Ophthal., Kbh. , Suppl. 44 , 109 .
5.
Corner
B. D.
(1952 ) Bristol med.-chir. J. , 69 , 117 .
6.
Drillien
C. M.
(1958 ) Arch. Dis. Childh. , 33 , 10 .
7.
Duke-Elder
S.
(1940 ) Textbook of Ophthalmology . London ; 3 , 3162 .
8.
Eames
T. H.
(1946 ) Amer. J. Ophthal. , 29 , 57 .
9.
Franceschetti
A.
(1957 ) Atti Soc. Oftal. ital., Milano , 17 .
10.
Fyfe
A.
(1960 ) In the press.
11.
Gregory
I. D. R.
(1957 ) Brit. J. Ophthal. , 41 , 321 .
12.
Guy
L. P.
(1954 ) Amer. J. Ophthal. , 38 , 65 .
13.
Hess
J. H.
Mohr
G. J.
Bartelme
P. F.
(1934 ) The Physical and Mental Growth of Prematurely Born Children . Chicago .
14.
Hill
A. B.
Doll
R.
Galloway
T. McL.
Hughes
J. P. W.
(1958 ) Brit. J. prev. soc. Med. , 12 , 1 .
15.
Ingram
H. V.
(1956 ) Trans. Ophthal Soc. U.K. , 76 , 133 .
16.
Knobloch
H.
Rider
R.
Harper
P.
Pasamanick
B.
(1956 ) J. Amer. med. Ass. , 161 , 581 .
17.
McNeil
N. L.
(1956 ) Brit. J. Ophthal. , 40 , 24 .
18.
Ryan
H.
(1956 ) Amer. J. Ophthal. , 41 , 310 .
19.
Schrire
L.
(1956 ) S. Afr. med. J. , 30 , 405 .
20.
Scobee
R. G.
(1951 ) Amer. J. Ophthal. , 34 , 817 .
