Material type of spectacle frame. Pure titanium: This kind of frame is the lightest, but it is not strong, expensive, stable and mature, and it is more suitable for successful men. Titanium alloy: good elasticity, low price and strong practicability, suitable for students. Memory titanium: strong memory, other titanium alloys. Plastic: poor elasticity, light weight, difficult deformation, low price and diverse colors and styles. There is also a tortoise shell picture frame, which is very light and durable, with strong metallic luster and very expensive (tens of thousands of yuan).
Half frame and full frame. The whole frame will look more mature, steady and strong, but it will be heavier than the same type of half frame. The half frame looks youthful, lively and energetic, not too strong or too light. As for which is good, it depends on personal hobbies.
Spherical lens and aspherical lens. Spherical lens will distort the objects in the marginal field of vision and limit the field of vision. The lens is thicker, but the spherical lens is cheaper. If the degree is not high (about 200 degrees), friends can consider it. Aspheric lenses are clearer, wider in field of vision, less distorted, more natural and lighter, but more expensive, and more suitable for patients with high myopia (above 300 degrees).
Refractive index of lens. The refractive index of a lens is 1.49, 1.56, 1.6 1, 1.67, 1.74, etc. The higher the refractive index of the lens, the thinner and lighter the lens with the same luminosity, and the higher the price. Patients with high myopia (about 600 degrees) generally recommend lenses with high refractive index, such as 1.74, 1.8 or even higher refractive index.
Lens material. At present, lens materials are mainly divided into resin and glass. Resin lenses are thinner, harder, less scratched and less fragile, and are the mainstream materials at present. Glass lens, this kind of lens has good light transmission, but it is relatively heavy and fragile, and it is not widely used at present.
Coating. There are coated and uncoated lenses. As the name implies, uncoated lenses are not coated with a film. Generally, coated lenses include blue film (anti-computer radiation), green film (anti-ultraviolet), red film (beautiful) and yellow-green film (anti-radiation, anti-ultraviolet waterproof and anti-fog), but the price of coated lenses is more expensive than that of uncoated lenses.
Does the frame have a nose pad? Nose-free frames are generally made of plate or plastic, which looks seamless, has a strong sense of integrity and is not easy to break, and is more suitable for people with high nose. Glasses with nose pads are generally made of metal, which is more suitable for people with low nose. However, the nose pad is easy to break and rust, which affects the appearance.
Glasses frame color. There are many kinds of glasses frame colors, such as black, white, blue, red, pink, metallic bright color and so on. You can choose according to your own preferences. Students generally suggest choosing black, dark blue or pink, which is lively and energetic. White-collar workers can consider black and metal bright colors, highlighting calm and capable.
Frame shape. The shapes of picture frames are generally round, rectangular and oval. Round (black frame) is generally recommended for girls to wear, which looks lively and lovely. Rectangular is recommended for successful people, while oval is generally suitable for young people and students. Again, just choose according to your own preferences.