Behind the iris, we have a transparent lens called the crystalline lens (natural lens). It allows the eye to switch instantly from clear distance vision to clear near vision.
Around the age of 40, this lens becomes less flexible and can no longer perform its focusing function properly. This condition is known as presbyopia.
From the age of 40 onwards, most people need to wear reading glasses.
Later, usually after the age of 60, the crystalline lens gradually loses its transparency, causing blurred or cloudy vision. This condition is called a cataract.
When the cataract becomes too bothersome and significantly affects vision, surgery is scheduled. The procedure consists of replacing the cloudy natural lens with an artificial lens, known as an intraocular lens (IOL) or implant.
This artificial lens restores clear vision and significantly improves visual quality.