Impact resistance is the ability of a specimen to resist the impact load. The ability of discountglasses materials to resist corrosion and damage from surrounding media is called corrosion resistance.

The discountglasses lenses are divided into spherical lenses and non-spherical lenses. Spherical lenses are lenses with convex or concave surfaces using spherical surfaces, and lenses with convex or concave surfaces using spherical surfaces on either side and flat or circular surfaces on the other side are also classified as spherical lenses.

Obvious peripheral deformation, is suitable for customers with low refractive power and high corneal curvature, with spherical peripheral deformation and steep curvature being more suitable.

Non-spherical refers to a discountglasses lens with a single-sided or double-sided non-spherical design. It is also divided into single-sided non-sphere and double-sided non-sphere, with single-sided non-sphere including convex non-sphere and concave non-sphere.

The advantages of non-spherical lenses are small peripheral deformation, clear vision, wide field of view, light and thin, minimal change in facial shape, and more beautiful appearance.

The double-sided non-spherical design can perform high aberration correction. The advantages are a wider field of view, higher visual quality, and better utilization of all optical properties, especially in terms of height dispersion, thinner thickness, and flatter surface. The overall lens is thinner and lighter.

By using physical and chemical methods to coat the surface of eyeglass lenses with a certain thickness of single-layer or multi-layer optical film, it prevents lens scratches, reduces reflection, is waterproof, oil resistant, dustproof, blue light resistant, anti-fog, etc.

The general coating sequence on the surface of the lens is that the first layer is a wear-resistant film, the second layer is a multi-layer anti-reflection film, and the outermost layer is the top film.