1. 1. A Rustigi, and D. Marcus Gastrointestinal and nutritional disorders. In: Albert DM, Jakobiec AJ (eds).Principles and Practice of Ophthalmology, 1st edn. Philadelphia: Saunders, 1994: 2975-85.
2. Effects of Vitamin A Deficiency on the Ocular Surface
3. Vitamin A Deficiency and Xerophthalmia
4. 5. EL. Berson Electrical phenomena in the retina. In: Hart WM (ed.).Physiology of the Eye, 9th edn. St Louis: Mosby, 1992: 641-7.