Reading glasses are neither myopia nor hyperopia. They are glasses used to correct presbyopia.
Reading glasses are glasses used to correct presbyopia. Presbyopia refers to the decrease in the ability of the eye to adjust the focus of close objects with age, resulting in poor near vision. The lenses of reading glasses are convex lenses with a larger thickness in the center and thinner edges. This design enables reading glasses to increase the eye's ability to focus on close objects. Therefore, reading glasses are glasses used to correct presbyopia.
Unlike presbyopia, myopia and hyperopia are two common refractive errors. Myopia refers to the decrease in the eye's ability to adjust the focus of distant objects, resulting in poor far vision; while hyperopia refers to the decrease in the eye's ability to adjust the focus of nearby objects, resulting in poor near vision.
The design principles of myopia glasses and hyperopia glasses are exactly the opposite. The lenses of myopia glasses are concave lenses, which are thinner in the center and thicker at the edges, so that the eyes can properly scatter the light of distant objects, so that its focus can be adjusted on the retina; while the lenses of hyperopia glasses are convex lenses, which are thicker in the center and thinner at the edges, so that the eyes can properly focus the light of nearby objects, so that its focus can be adjusted on the retina.
In summary, reading glasses are glasses used to correct presbyopia, while myopia glasses and hyperopia glasses are glasses used to correct myopia and hyperopia. These different types of glasses have different lens designs to meet the correction needs of different refractive errors.
