Large Pupils and Lasik

Large Pupils are well associated with Lasik surgery.

One of the most well-known risks and disturbing post-operative side effects of refractive surgery is halos, glare, decreased contrast sensitivity, and starbursts seen at night or in a dark environment. There are several reasons why patients experience post-operative halos, glare, and starbursts. These include the induction of higher order aberrations such as spherical aberration, coma, and trefoil, as well as diffraction off the edge of the treatment zone in patients with large pupils, made worse by an excessively flat corneal curvature after surgery. In some patients, the pupils can dilate in the dark to as large as 8-9mm in diameter. Generally, this is not a problem. However, following refractive surgery, the pupil may dilate wider than the zone of treatment, thereby causing reflection. This can also cause diffraction of incoming light off the edge of the treatment zone.

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