What is myopia lens? Concave lens or convex lens?

The main symptom of myopia is that you can't see things far away. The function of myopia glasses is to correct vision and maintain the adjustment ability of ciliary muscle of the eye, so as to help myopia patients see things far away.

Because the lens of myopia becomes thicker and the distant light cannot be focused on the retina, it is not clear to see the distant scenery, while myopia glasses have the function of divergent light. After wearing myopia glasses, you can get a clear image.

Myopia glasses are concave lenses

Myopia is mainly due to the deformation of the lens (the lens thickens), which leads to the premature collection of light in front of the retina.

The concave lens plays the role of divergent light. The concave lens becomes an upright and reduced virtual image, which lengthens the image distance and just falls on the retina.

Therefore, concave lens is mainly used to correct myopia.

Concave lens is also called negative spherical lens because its focus is in the opposite direction of light propagation direction, and the diopter is expressed by negative value.

Concave lens is also called concave lens because its center is thin and its edge is thick and concave.

Concave lens has divergent effect on light and can be used as myopia glasses.

Introduction of myopia lens

The lens of myopia belongs to optical lens.

Generally speaking, the optical lens refers to the lens that can change the propagation direction of light. The lens of camera lens is also an optical lens. Therefore, theoretically, the lens of myopia glasses and the lens of camera lens are actually the same kind of things.

Myopia lens has many important parameters, such as the diopter and refractive index of the lens.

The materials of lenses mainly include glass and resin lenses.