Page 28 - The UK Guide to Laser Eye Surgery
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28 Common misconceptions about laser eye surgery
 The treatment is not permanent
Long-term follow-up studies have demonstrated that once the shape of your cornea is changed to correct your vision, the change is permanent. Of course, your eye is a living organ and alters over the years, just as the rest of your body does. Everyone’s eyes change to some degree, even if they have never needed glasses. However, studies have shown that changes after surgery tend to be very small, and develop very slowly. Once you reach the age of 50, your prescription will only change by an average of half a dioptre every decade.
You can be too old for laser eye surgery
Technically, there is no upper age limit for laser eye surgery as long as the eye
is healthy.
You can go blind
This is practically impossible. Realistically, the chance of going blind from laser eye surgery in the hands of an expert surgeon using the best technology is almost too small to measure - probably in the region of 1 in 5 million.
You could end up with worse vision than you started with
This question deals with two issues: Vision without glasses – uncorrected vision loss: There is virtually no chance that your vision without glasses after laser eye surgery would be worse than without glasses for the specific tasks that you needed them before surgery.
Vision with glasses – loss of corrected distance visual acuity: Your maximum clarity with glasses before surgery is known as your ‘corrected distance visual acuity’ (CDVA). In expert hands, the chance of your CDVA being reduced by even a small amount is around 1 in 1,000 (0.1%) for the majority of patients. For those with higher prescriptions, the risk may be higher, and this will be indicated at your screening appointment if it applies to you.

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