Does LASIK Affect Future Eye Health? Retina, Cataract and Glaucoma Explained

What LASIK Changes — and What It Doesn't

LASIK changes the curvature and thickness of the central cornea and nothing else. The laser works on a thin layer of corneal tissue at the front of the eye. It does not reach:

• The natural lens, where cataracts form
• The retina, the light-sensitive layer at the back of the eye
• The optic nerve, which glaucoma affects
• The length of the eyeball, which is what makes most short-sighted eyes short-sighted in the first place

That last point is important. LASIK corrects the focusing error, but it does not shorten the eye. Any eye-health risks that come from being short-sighted — especially highly short-sighted — remain the same after LASIK. That is why regular eye check-ups still matter even when you no longer need glasses.

Does LASIK Affect Retina Health?

No — LASIK does not affect the health of the retina. The retina sits at the back of the eye and the laser never reaches it.

However, people with moderate to high myopia (minus power) have a higher natural risk of retinal problems such as thin areas, tears and detachment, because their eyes are longer and the retina is stretched. LASIK does not create this risk, but it does not remove it either.

What this means for you:

• Before LASIK, a good centre examines the retina with dilating drops. If weak or thin areas are found, preventive laser treatment of the retina may be advised first.
• After LASIK, keep having dilated retinal check-ups as your eye doctor advises — especially if your original power was high.
• Know the warning signs of a retinal tear or detachment: a sudden shower of new floaters, flashes of light, or a shadow or curtain across your vision. These need urgent same-day attention, whether or not you have had LASIK.

If you need retinal treatment in future, such as laser, injections or surgery, having had LASIK does not usually prevent it. Just tell your retina specialist about your previous surgery.

Does LASIK Increase Cataract Risk — or Prevent Cataracts?

LASIK neither increases nor reduces your risk of cataract. A cataract is clouding of the natural lens inside the eye, which develops with age; LASIK works on the cornea, a completely separate structure in front of it.

Will I still get cataracts after LASIK? Yes, at roughly the same age you would have without LASIK. Most people develop some cataract from their 60s onwards, though it can be earlier with diabetes, long-term steroid use, smoking, heavy sun exposure, eye injury or high myopia. LASIK does not speed this up or slow it down.

Can LASIK prevent cataracts? No. There is no laser treatment of the cornea that stops the lens from ageing. If someone tells you LASIK will spare you cataract surgery later, that is incorrect.

One related point: from the mid-40s, the lens also loses its ability to focus up close (presbyopia), so reading glasses are usually needed eventually. That is also lens ageing, and it is not caused or prevented by LASIK.

Cataract Surgery After LASIK: Why Lens Power Calculation Is Different

Cataract surgery after LASIK is routine and safe, but choosing the power of the new lens (IOL) needs extra care. In cataract surgery, the cloudy lens is replaced with an artificial lens whose power is calculated from measurements of your cornea and the length of your eye.

Standard calculation formulas make assumptions about the relationship between the front and back of the cornea. LASIK changes the front surface, so those assumptions no longer hold, and a standard calculation can choose the wrong lens power. After LASIK for short-sightedness, this typically leaves the eye slightly long-sighted if it is not corrected for — a so-called 'refractive surprise'.

How surgeons handle it:

• They use formulas designed for eyes that have had laser surgery — for example Barrett True-K or Haigis-L — often comparing several methods.
• Modern biometry and corneal imaging measure the cornea more completely.
• Your original pre-LASIK measurements, if available, can make the calculation more reliable.

Even with all this, results after LASIK are a little less predictable than in an untreated eye. A small residual power may need glasses or a later laser touch-up. Your cataract surgeon may also be more cautious about some premium lens types, such as certain multifocal lenses, depending on your corneal shape. For more on lens choices, see our IOL guide.

Keep Your Corneal Records — Your Future Cataract Surgeon Will Thank You

The single most useful thing you can do for your future eyes after LASIK is to keep a copy of your surgical records. Cataract surgery may be 20 to 40 years away, clinics change, and records get lost.

Ask your LASIK centre for, and store safely (paper and a phone or cloud copy):

• Your glasses prescription before LASIK
• Your corneal measurements before surgery — keratometry (K readings), topography and corneal thickness
• Details of the procedure: type (LASIK, SMILE, PRK), date, laser platform and the amount of correction treated
• Your stable glasses prescription a few months after surgery
• Any enhancement procedure and its details

At every future eye appointment — for glasses, pressure checks, diabetes screening or cataract assessment — tell the doctor that you have had laser vision correction. It changes how several tests are interpreted.

Glaucoma and Eye Pressure Readings After LASIK

LASIK does not cause glaucoma, but it can make your eye pressure read lower than it really is. The most common pressure tests press lightly on the cornea. After LASIK, the cornea is thinner and flatter in the centre, so it gives way more easily and the reading tends to be underestimated.

Why this matters: glaucoma is often detected because of raised pressure. If a reading looks normal but is actually falsely low, early glaucoma could be missed.

What to do:

• Always tell any eye doctor you have had LASIK so they can interpret the reading correctly — for example by considering corneal thickness, using a different type of tonometer, or relying more on optic nerve imaging and visual field tests.
• Have regular eye check-ups from your 40s, and earlier if you have a family history of glaucoma, high myopia or diabetes.
• Tell your LASIK surgeon about glaucoma or a family history before surgery. It doesn't automatically rule you out but needs careful assessment.

In the weeks after LASIK, steroid eye drops can raise eye pressure in a minority of people. This is one reason your follow-up visits include pressure checks and why drops should be tapered exactly as prescribed.

Can You Have LASIK After Cataract Surgery?

Yes, LASIK or PRK can often be done after cataract surgery to correct leftover power or astigmatism, provided the cornea is healthy and thick enough. After cataract surgery, some people are left with a small prescription because the lens calculation was slightly off or because of astigmatism that the lens did not correct. A laser touch-up on the cornea can fine-tune this.

Practical points:

• Wait for stability. Surgeons usually wait until the eye has fully healed and the prescription is stable — typically at least a few months after cataract surgery.
• The cornea must be suitable. The same corneal thickness and shape rules apply as for any LASIK. PRK may be preferred in some cases.
• There are alternatives. Depending on the situation, your surgeon may suggest exchanging the lens, adding a second 'piggyback' lens, or simply using glasses.
• Reading vision is separate. If you have a standard single-focus lens, LASIK can sharpen your distance vision but won't restore natural near focusing; options such as monovision can be discussed.

If you have had cataract surgery and are thinking about laser correction, bring your cataract surgery records and lens details to the consultation.