Cataract surgery is more than removing a cloudy lens – it is also a chance to get rid of your refractive error

Most patients think of cataract surgery purely as the removal of a cloudy lens that “blocks” the image. Yet the same operation is at the same time the most effective surgery for correcting refractive error — myopia, hyperopia, astigmatism and, with the right lens, presbyopia too. People who have worn glasses all their lives often see better without them after cataract surgery than ever before.

Why does cataract surgery correct refractive error?

Put simply, a refractive error is a mismatch in the optical system of the eye — light does not focus exactly on the retina. The natural lens is responsible for a significant part of the eye’s optical power. During cataract surgery it is removed and replaced with an artificial intraocular lens (IOL), whose power we choose individually for each eye.

This means that when designing the new lens we can “build in” the correction of the existing refractive error. A patient with −8 dioptres of myopia, who has not been able to recognise faces without glasses since childhood, can see sharply at distance after surgery with no correction at all. The cataract ceases to exist “along the way” — and with it the refractive error.

Which errors can be corrected?

Myopia and hyperopia — corrected by the power of the implanted lens, across practically the whole range, including very high errors that do not qualify for laser correction.

Astigmatism — corrected with a toric lens, precisely positioned in the right axis during surgery. Without this correction the image would remain blurred despite the cataract being removed.

Presbyopia — the need for reading glasses. Here EDOF and trifocal lenses come to the rescue, restoring sharp vision at near and intermediate distances too. We describe the differences between them in a separate article.

The condition: precise measurements before surgery

For the new lens to truly neutralise the refractive error, its power must be calculated to a fraction of a dioptre. This is the job of optical biometry — a non-contact measurement of the length of the eye, the curvature of the cornea and the depth of the anterior chamber — supplemented by corneal topography and aberration analysis.

At OKUMED we take these measurements on premium-class equipment (ZEISS, HAAG-STREIT) and analyse the result taking into account not only the numbers but also the patient’s lifestyle: work, hobbies, night driving. This makes the choice of lens an informed decision and the result predictable.

I don’t have a cataract but want to get rid of glasses — RLE

The same mechanism is used in refractive lens exchange (RLE). It is technically an identical procedure, performed in people who do not yet have a cataract but want to permanently correct their refractive error — especially after the age of 40–45, when presbyopia appears and laser correction is no longer the optimal solution. A bonus: an eye after lens exchange will never develop a cataract.

What to remember

Cataract surgery today is a refractive procedure — one of the most frequently performed and safest operations in all of medicine. When deciding on it, it is worth not only “removing the cataract” but consciously seizing the chance of a life without glasses. The key is careful diagnostics and a lens matched to your eye and daily needs.

Book a qualification consultation at OKUMED — Świętojańska 135/2, Gdynia, phone +48 882 650 299 or via ZnanyLekarz.

---

This article is for information only and does not replace a medical consultation.