Refractive Surgery 

with Intraocular Lenses (IOLs)

Refractive Surgery with Intraocular Lenses (IOLs)

When the cornea is not suitable for laser treatment, lenses are implanted inside the eye. They are divided into:

A. Phakic Lenses (without removing the natural lens)

ICL (Implantable Collamer Lens):

Collamer lens placed between the iris and the lens.

Advantages

Reversible, corrects high myopia (up to -20D) and astigmatism.

Uses

Stable keratoconus, thin corneas.

B. Pseudophakic Lenses (replace the lens, as in cataract surgery)

Monofocal:

Correct distance vision (need glasses for near vision).

Extended Range Vision (EDOF):

Intermediate and distance vision (less dependence on glasses).

Multifocals/Trifocals:

Allows distance, intermediate, and near vision (without glasses).

Risk: Nighttime halos.