In cataract surgery, the natural lens is removed and replaced with an artificial lens to improve patient's vision. This artificial lens is called an intraocular lens.
The lenses used in cataract surgeries may divided into three groups:
With the single focus lenses we call the monofocal intraocular lens in the first group, the patient sees long sight but has to wear short-sighted glasses, for example, to read the book, the newspaper, to see the short sight.
In the second group, intraocular lenses are multifocal lenses, long side and short side; if the patient does not have an eye disease that reduces his/her vision other than cataract, the patient can see both the long sight and the short sight without glasses.
Trifocal intraocular lenses, known as Smart Lenses, are three-focal, and if the patient does not have an eye disease that reduces his/her vision other than cataract, the patient can see the long sight, the short sight, and the intermediate distances (distance between 40 cm and 2 meters) without glasses, when this lens is inserted.
The age, occupation, expectations and current eye diseases of patient has a decisive role in lens selection.
The latest technology lenses provide excellent vision at day and night, while the colours are net and clearer.