1. From the Ophthalmology Departments of the Fondation Ophtalmologique Rothschild, Paris, France; the2Centre Hospitalier National des Quinze-Vingts, Paris, France; and the
2. Ho^pital Lariboisie`re, Paris, France; and from the
3. Therapeutic Research Unit, the
4. Physiological Exploration Unit, and the
5. Clinical Research Unit of the Ho^pital Lariboisie`re, Paris, France.