How Does LASIK Cause Problems With Night Vision?
It is not uncommon to notice unusual visual symptoms at night after LASIK. Patients often report symptoms of haloes, glare, or a general feeling of poor night vision. Fortunately, these symptoms almost always resolve with time. There has been a large amount of debate as to the cause of night vision symptoms after LASIK. What is known is that it is much less common than it was with the older generation laser treatments. There are some patients who had LASIK surgery many years ago who will require frequent eye drops to minimize the symptoms. The major debate has surrounded whethere the size of a persons pupil at night plays into night vision symptoms. In the dark,a person’s pupil will enlarge in size. Some people believe that it is this enlargement of pupil size that causes the night vision complaints. More specifically, the pupil size has enlarged to allow light in that is outside the optical zone created by the laser. Therefore, this light is reflected in a different manner than light
