In people who have had cataract surgery, the membrane behind the lens placed in the eye becomes dull over time. This dullness slowly decreases vision. The patient feels as if cataracts are starting again. After enough time from the operation, this dullness should be removed with YAG laser application (capsulotomy).

YAG laser application is actually a light therapy and it can be applied to the eye without any device or tool contact. The application is done while the patient is sitting on the examination chair. In the treatment of some types of glaucoma, eye pressure is reduced by performing iridotomy with YAG laser. This process is the creation of a millimetric opening in the iris tissue that gives the eye its color.