Tablet for opthalmic use with controlled release of the active substance

A tablet for ophthalmic use with controlled release of the active substance applicable both in the human and veterinary field. In said tablet a surface portion (a) is coated with polymer material (b) which is impermeable and/or insoluble or only slowly soluble in water, and can be further coated with bioadhesive polymer material (c). The tablet, which can be positioned in the conjunctival sac of he eye and remain there for a programmed time period, enables the number of medicament administrations to be reduced and is usable in particular for prolonged therapeutic treatment. It is furthermore described a preparation method.