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.
Today there is a wide variety of premium IOLs to choose from.
This condition lengthens eyesight as the focusing system becomes less flexible with age and near sight becomes more difficult.
Most people require reading glasses as they reach middle age for this reason.
The trifocal implant has the advantage of offering clear intermediate as well as distance and near vision with minimal glare and haloes at night.