Medical device for preserving explanted corneas, serving as a “viewing chamber”, comprising a sealed outer main case (2) which contains a container (3) for preserving and viewing a cornea which comprises a vessel (4) which inside it forms a preserving chamber, (11), a supporting unit (12) for a corneoscleral disc positioned in the preserving chamber (11), and a first lid (5) removably joinable or joined to the vessel (4)； the medical device (1) being ready for use and also comprising a first locking ring (18) which is joinable or joined to both the first lid (5) and to the vessel (4), outside them, and is breakable or deformable； wherein when the first lid (5) is joined to the vessel (4) and the first locking ring (18) is joined both to the first lid (5) and to the vessel (4), in an intact and non-deformed condition, the first locking ring (18) prevents removal of the first lid (5) from the vessel (4), whereas in a broken or deformed condition, the first locking ring (18) allows removal of the first lid (5) from the vessel (4).
