Can myopia offset presbyopia when young? This sentence is only half right. Myopia is caused by a lengthening of the anteroposterior diameter of the dry eye or a steepening of the corneal curvature, resulting in blurred vision in the distance. Wearing prescription glasses for myopia is a negative degree. Presbyopia is caused by a decrease in the ability of the eyeball to regulate as one gets older, resulting in unclear close-up vision. The reading glasses worn are positive.

For example, people with 200-degree myopia do not need to wear glasses when looking up if they have 200-degree presbyopia after getting old, because the positive and negative 200 degrees cancel out to 0, but it does not mean that the presbyopia is gone, but in this case, they do not need to wear glasses.

Presbyopia is a physiological change, as the elasticity of the lens deteriorates with age, and no amount of tension in the ciliary muscle can cause changes in the lens. The lens has over 1000 degrees of adjustment ability, which can cause a loss of speed of 50-100 degrees every five years, resulting in insufficient adjustment ability when looking closely. Therefore, everyone will suffer from presbyopia, and it is necessary to wear convex lenses to supplement refractive power.

If you have already developed presbyopia by the age of 40 or above, forcing yourself not to wear reading glasses can exacerbate reading difficulties, produce symptoms such as dizziness and eye bloating, and affect your life and work. For example, at the age of 40, presbyopia is 100 degrees Celsius, and by the age of 50, whether wearing glasses or not, presbyopia will increase to 200 degrees Celsius, and matching presbyopia glasses also require optometry.