Before revision: For example, erosion, where the conjunctiva erodes over the shunt leaving it exposed, the condition of which may be revised or prevented in advance by the use of amniotic membrane, donor patch grafts, or collagen matrix implant.
After revision: For example, erosion, where the conjunctiva erodes over the shunt leaving it exposed, the condition of which may be revised or prevented in advance by the use of amniotic membrane,