Myopic patients will gradually develop presbyopia after middle and old age, and the two will not cancel each other out. Many people now have the misconception that myopic people will not develop presbyopia because the two degrees will cancel each other out and the myopia will decline after middle and old age, but this is obviously incorrect. This is because these are two different refractive states. Myopia is due to abnormalities in the refractive power of the eye, which leads to a decrease in distance vision and very blurred vision when looking at a distance. Presbyopia is a degenerative disease, which is due to the increased hardness and decreased elasticity of the lens, so it leads to a decrease in the eye’s ability to adjust, which leads to a decrease in near vision, which manifests as difficulty in reading at close range, and a preference for placing the target far away when reading, so that it feels clearer to see. So the two do not cancel each other out, they can exist at the same time. After reaching this stage, the eyes are not clear even at close range and not clear even at far range, so you need to wear both nearsighted glasses and presbyopic glasses.