Page 64 - The UK Guide to Laser Eye Surgery
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64 Frequently Asked Questions
 If you do have glare and halos at night because of your pupil size, there are a few techniques that can help. Some patients find that keeping the overhead light on inside their car when driving stops their pupils dilating so much that it affects their vision. There are also medicated eye drops that stop the pupil from dilating fully, and some patients find that these fully alleviate the problem. Alternatively, clinics with access to an excimer laser that includes
a topography-guided treatment option can perform a second treatment that can reduce these symptoms.
Finally, glare and halos can be caused if the area of your cornea treated by the laser
is off to one side (known as ‘off-centred ablation’ or ‘decentration’). Choosing a properly qualified and experienced surgeon can help to minimise the risk of this serious complication. Specialist clinics will be able to perform a topography-guided treatment to re-center the treated zone and improve the quality of vision.
In general, using advanced wavefront technology can significantly reduce the risk of glare, halos and night vision difficulties resulting from surgery (see Technology section for further detail).
Q: How does the flap stay in place in LASIK?
Initially, the flap is kept in position by
a vacuum effect. The cells lining the
inner surface of your cornea - known as endothelial cells - pump water out to the inner part of the eye. This creates suction, which holds the flap in place. During the first few hours after surgery, the outer surface of the cornea - known as the epithelium - seals the edges of the flap. Over the ensuing weeks, natural substances inside your cornea bond the flap to the underlying tissue.

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