Refractive Surgery: saying goodbye to glasses

Refractive surgery is the set of techniques that correct vision defects – myopia, hyperopia, astigmatism, and presbyopia by acting directly on the structures of the eye, making glasses and contact lenses unnecessary. The underlying idea is simple and fascinating: if the defect arises because images are not focused exactly on the retina, the eye’s optical system is modified until the focus returns to the right place.

In most cases, this is achieved by reshaping the cornea, the transparent window covering the front of the eye that acts as our “first lens.” By using a laser on its surface, its curvature is changed by a few fractions of a millimeter, and with it, the way light rays are bent.

Laser-based techniques

PRK (photorefractive keratectomy) is the most well-established surface technique: the extremely thin layer of cells covering the cornea is removed, and the underlying tissue is reshaped using an excimer laser. Femto-LASIK, on the other hand, uses a femtosecond laser to create a thin corneal flap that is lifted to allow the laser to work at depth, then repositioned; visual recovery is faster. SMILE, the most recent technique, extracts a small lenticule of tissue from within the cornea through a microincision, without creating any flap.

When the cornea isn’t enough: phakic lenses

Not all eyes are suitable for laser treatment. When the defect is very severe, or the cornea is too thin, implantable phakic lenses can be used, in particular the ICL (Implantable Collamer Lens) an extremely thin lens inserted inside the eye without removing the natural lens. It is a reversible solution particularly valued for high degrees of myopia.

The goal of refractive surgery: a life free from glasses and contact lenses.

How it is performed

Laser surgery is performed on an outpatient basis and is painless: it is carried out under topical anesthesia, using anesthetic eye drops, and lasts only a few minutes per eye, of which the laser itself takes just a few tens of seconds. The patient returns home within an hour. With femto-LASIK and SMILE, recovery is often a matter of a couple of days; with PRK, a few more days are needed, since the corneal epithelium must regrow.

The importance of preliminary examinations

The true heart of refractive surgery is not the day of the procedure, but the evaluation that precedes it. Today we have corneal topography and tomography, examinations that map the cornea, its thickness, and its regularity in great detail, and which are essential for ruling out hidden weaknesses such as early keratoconus. It is this in-depth study that determines whether, and with which technique, an eye can be safely operated on.

In conclusion

Refractive surgery has today reached remarkable levels of precision and safety, but it is not an “off-the-shelf” procedure: every eye is different, and the right technique for one patient may not be right for another. This is why the choice always begins with a thorough eye exam and an honest conversation about expectations the first step toward entrusting your eyes to the laser with peace of mind.