When you wear myopic glasses, you can see clearly at a distance, but not at a close distance, mostly due to myopic overcorrection or old vision. 1. Myopia overcorrection. When you wear high myopia glasses, you can see clearly at a distance without too much adjustment, but when you look at a close distance, you need to use more adjustment than normal to look closer, and the object cannot be imaged on the retina, so it is easy to appear the phenomenon of not seeing clearly at a close distance. 2. Presbyopia. Mostly seen in middle-aged and elderly patients over 40 years old. The elasticity of the lens of the eye decreases due to old age, thus affecting the adjustment function of the eye, and the phenomenon of unclear vision at near places occurs. Specific causes need to go to the hospital for examination and clarification.