The following is a complete answer to the reason why you have this situation, which is the most common sequela? Glare.

As we all know, the pupil will dilate and contract the pupil for optics.

Above: On the left, the pupil diameter is enlarged in dark environment, and on the right, the pupil diameter is reduced in bright environment.

Image above: If your normal pupil is 5mm.

Above: Considering the dark environment during the operation, the diameter of laser scanning is about 6 mm.

Image above: If your pupil is larger than 6mm in dark environment.

The scanning diameter of laser surgery is about 6 mm, and your pupil is larger than 6 mm in dark environment. The visual quality is very good when the light is strong and the pupil is small during the day. If the pupil is naturally scattered at night when the light is dim, and the diameter exceeds 6 mm, the laser scanning area cannot completely cover the pupil at night. If the pupil area is not treated, a small amount of myopia light will enter the eye, which will overlap and interfere with the light in the central area, resulting in glare. Once glare appears, the visual quality will decrease at night, and it will be more difficult to drive at night.

Of course, there are other factors. If the degree of myopia is high, the slope of the edge of the cut position and the uncut position is too steep, and the residual high-order aberration of the eyeball will also cause the visual quality to decline.