Squint surgery is a very common eye operation. It usually involves tightening or moving one or more of the outside eye muscles which move the eye to change the eye position. These muscles are attached quite close to the front of the eye under the conjunctiva, the clear surface layer.Squint surgery is nearly always a day-case procedure, so you should be in and out of hospital on the same day. There are two kinds of squint operation - adjustable and non-adjustable. In adjustable surgery, which can be performed in older children and adults, the stitches can be adjusted shortly after the surgery, when the patient is awake..