Traité des maladies de l’oeil

Called “the Father of French ophthalmology”, Maître-Jan energetically supported Brisseau’s doctrine, ensuring its acceptance. As far back as 1692, Maître-Jan had proved that the opaque lens is cataract, but before Brisseau’s work appeared it had been regarded as a sort of skin or pellicle immediately inside the capsule of the lens.