1. From the Ophthalmic Genetics and Visual Function Branch, National Eye Institute, Bethesda, Maryland; and2les Services des Maladies Conge´nitales et He´re´ditaires et
2. d’Ophtalmologie, E.P.S. Charles Nicolle, Tunis, Tunisia.
3. From the Ophthalmic Genetics and Visual Function Branch, National Eye Institute, Bethesda, Maryland; and
4. les Services des Maladies Conge´nitales et He´re´ditaires et