Procedure Explainers

ICL Explained: Implantable Collamer Lens Surgery

Quick Answer: ICL surgery places a prescription Implantable Collamer Lens inside the eye, behind the iris and in front of the natural lens. It is often considered for people who are not ideal LASIK candidates because of a high prescription or corneal considerations. The natural lens stays in place, and the ICL may be removed or exchanged if clinically appropriate.

ICL stands for Implantable Collamer Lens. It is also called a phakic intraocular lens, or phakic IOL. In ICL surgery, a prescription lens is placed behind the iris and in front of the eye's natural lens. The natural lens remains in place.

How ICL Works

ICL corrects refractive error by adding a lens inside the eye rather than reshaping the cornea. This makes it different from LASIK and PRK, which reshape corneal tissue. It is also different from refractive lens exchange, which removes the natural lens.

The surgeon makes a small incision near the edge of the cornea. The flexible lens is folded, inserted through the incision, unfolded, and positioned behind the iris and in front of the natural lens. Follow-up visits are important to assess healing, vision, lens position, and other eye-health findings.

Why ICL May Be Considered

ICL is often discussed for people who are not ideal candidates for laser vision correction because of a high prescription or corneal considerations. Since it does not permanently remove or reshape corneal tissue, it may be relevant when corneal thickness makes LASIK less suitable. It is not automatic: people considering ICL need an ICL-specific eye examination.

The lens may be removed or exchanged if clinically appropriate. This is commonly described as reversibility, but removal is still surgery and is not a guarantee that every future vision issue can be reversed.

Candidacy

Candidacy involves much more than a prescription. The surgeon reviews visual stability, eye health, corneal findings, medications, general health, and visual goals. ICL-specific considerations include anterior chamber depth and endothelial cell count. The anterior chamber must have appropriate anatomy and space for the lens, and endothelial-cell health is important for long-term corneal clarity. These findings require professional measurements and interpretation rather than online cutoffs.

Recovery and Long-Term Care

Recovery varies by patient. Follow the surgeon's directions for prescribed drops, activity, driving, and follow-up. ICL corrects refractive error but does not prevent later eye conditions or age-related vision changes, so regular eye care remains important.