Why is pupil size important?
The pupil of the eye is the round hole or aperture located in the middle of the iris or colored part of the eye. The pupil is generally round, and changes size depending on the amount of light to which the eye is exposed; when lighting is bright, the pupil constricts or becomes smaller; when lighting is poor, the pupil dilates or becomes larger. In general, it is desirable to have the size of the treatment zone (made by the laser on the cornea) at least as large as the pupil becomes under dim lighting.The cornea is the clear dome-like structure that arches over and covers the front of the eye. The pupil and iris are behind the cornea, “under glass”, so to speak. The human cornea is about 11-12 mm in diameter. However, the corneal flap is typically smaller than the size of the cornea, as large as 9.5 mm.
