What's the difference between cataract and presbyopia?

Cataract and presbyopia are two different disease concepts. Cataract is due to the gradual increase of lens density and denaturation of crystalline protein with age, which leads to the decrease of lens transparency and affects vision. It's called cataract. Presbyopia is that with the increase of age, the density of the crystal increases, the elasticity of the crystal decreases, and the adjustment function of the ciliary muscle gradually weakens, which makes it difficult for us to read and work at close range, thus leading to the decline of the adjustment ability of the eye. This function is called presbyopia. People with presbyopia are not affected in the distance, but in nearby places. Cataract, far and near, is a decline in vision and cannot be adjusted by wearing glasses. Generally speaking, presbyopia appears after the age of 40. With the growth of age, the degree of aging will deepen year by year, so when we match presbyopia glasses, don't match expensive ones, because with the growth of age, the degree of presbyopia will increase year by year.