References
- Dorland's Illustrated Medical Dictionary, ed 25. Philadelphia, W.B. Saunders, 1974, pp 1522–1523.
- Faye FE: The Low Vision Patient Clinical Experience With Adults and Children. New York, Grune & Stratum, Inc, 1970, pp 111–112.
- Walsh FB: Clinical Neuro-Ophthalmology, ed 2. Baltimore, Williams & Wilkins Co, 1956, pp 382–384.
- Adler FH: Physiology of the Eye Clinical Application, ed 5. St Louis, CV Mosby Co, 1970, p 313.