Accomodating intraocular lenses
Before the use of intraocular lenses, if you had cataracts removed, you had to wear very thick eyeglasses or special contact lenses in order to see after cataract surgery, since no device was implanted in the eye to replace the focusing power of the natural lens.
Though a spherical IOL is relatively easy to manufacture, this design does not mimic the shape of the natural lens inside the eye, which varies in curvature from center to periphery.
Prior to the development of toric IOLs, cataract surgeons had to perform a procedure call limbal relaxing incisions (LRI) to correct astigmatism during or after cataract surgery.
In LRI, small incisions are made at opposite ends of the cornea, very near the junction between the cornea and the surrounding white sclera.
C75.1 Insertion of prosthetic replacement for lens NEC Note: A supplementary OPCS-4 code is used to identify the method of concurrent extraction of lens (C71-C74) It is not possible to capture the type of lens using OPCS-4.
This guidance represents the view of NICE, arrived at after careful consideration of the evidence available.