Nearsightedness does not cause the pupil to become larger. Myopia is caused by a change in the refractive state of the eye, such as an elongation of the eye axis, which results in a decrease in naked eye vision, a condition that has nothing to do with pupil size. Under normal circumstances, if you are in a darker environment or at night, your pupils are larger than normal because of low light, which is a physiological phenomenon. Therefore, when the pupil is dilated, it is not related to myopia in the first place. In addition, it is important to go to the hospital in a timely manner to examine the specific cause of the problem and provide symptomatic treatment. If the pupil is dilated due to trauma, there is usually no treatment for this condition, and the photophobia can be improved by wearing dark glasses or sunglasses.