The action of couch, v.1, in various senses.

Surgery. A form of couching for cataract (or, later, for dislocation of the lens) in which the lens is laid back into the vitreous with its…

The operation of dividing one or more of the muscles of the eye as a remedy for strabismus.

Excision of a portion of the iris. Also attributive.

Section of the iris.

An operation in which the iris is secured in a certain position by a ligature.

Surgery. The removal of an eye from the socket.

Ophthalmology. Excision of a strip of conjunctiva around the cornea; an instance of this. Also called syndectomy.

Excision of a strip of conjunctiva around the cornea; peritomy.

the artificial separation of the iris from the ciliary ring.

Incision into the sclerotic coat of the eyeball; an operation of this kind.

The incision of a capsule, spec. that of the lens of the eye in an operation for cataract.

Surgery and Medicine. The use or insertion of a surgical, biopsy, or hypodermic needle (originally spec. to couch or extract a cataract).

Surgery. Removal of the contents of the eyeball.

An operation for relieving the tension of the eyeball in cases of glaucoma (see quot. 1964).

The operation of removing the vitreous fluid from the eyeball and replacing it with another fluid.