1. ANDERSON, D. R., and SPENCER, W. H. (1970) Arch. Ophthal., 83, 324
2. GOULDING, H. B. (1927) Trans. ophthal. Soc. U.K., 47, 442
3. Brit;HAMILTON, A.M.; GARNER, A.; TRIPATHI, R.C.; SANDERS, M.D.;J. Ophthal,1973
4. , MESHEL, L. G., LESSELL, S., SCHATZ, N. J., and SUCKLING, R. D. (1973) Brain, 96, 12I
5. LUSE, S. A. (1961) 7. Neurosurg., 19, 466 MARTIN, P., and CUSHING, H. (1923) Arch. Ophthal., 52, 209