Page 63 - The UK Guide to Laser Eye Surgery
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Frequently Asked Questions
 • Most laser eye surgery patients experience some temporary dryness after treatment. In certain people, the condition is long-lasting. Eye drops can provide relief, but up to 5% of patients have persistent dry eye symptoms up to 1 year, and 1% longer than 1 year.
• Glare and ‘halos’ are probably the most common side-effect of laser eye surgery. Most patients indeed experience some level of glare and halos at first, but this generally goes away over a period of
a few weeks to a few months. Those who do have lasting effects usually only experience symptoms at night, and most do not find them troublesome, and can usually be improved by further surgery.
Q: What causes glare and ‘halos’ and can it be treated?
There are several reasons why a patient might develop glare and / or ‘halos’ after laser eye surgery:
If you have been ‘under-corrected’ (i.e.
if the shape of your cornea has not
been changed enough during your procedure), you may still be slightly short or long-sighted and/or still have a minor astigmatism.
A minor enhancement procedure can usually address this. For the small minority of patients who are not candidates for
an enhancement, wearing glasses can generally get rid of any troublesome symptoms.
The size of your pupils can be another cause of glare and halos. If a patient’s pupils dilate (open) beyond the area of the cornea that has been treated during laser eye surgery, this can cause glare and halos in low light conditions. The risk of this
can be mitigated by accurately measuring your dilated pupil size before surgery. The surgeon can determine whether or not they can effectively treat a large enough area of your cornea with the laser, and if this is not possible then the surgeon should decide not to treat you.
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