The weight of the front end of glasses varies with different degrees, so the matching method of each component of the discount prescription glasses is also different. The higher the refractive index, the thinner the lens, and the more expensive it is.

However the refractive index is not necessarily better, it mainly depends on the degree. Choosing the appropriate thickness for a reasonable degree corresponds to the appropriate refractive index so that the discountglasses will not be too heavy.

A larger Abbe number will be better, and the larger the value, the smaller the dispersion and clearer it is. It is said that most human eyes cannot perceive the difference in dispersion clarity caused by changes in Abbe numbers, so most people will choose thinner Abbe numbers instead of higher ones.

There is an inverse correlation between the Abbe number and the refractive index. Choose nonspherical glasses, not spherical glasses. Anti-radiation, and brand lenses all have this function, don't listen to gimmicks. Prevent blue light and rest with your eyes.

If the height is too high, do not choose materials with good elasticity (lighter). You can choose materials such as sheet metal, metal, or alloy. Due to the high degree, the front end of the cheapest eyeglasses will be heavier, and if the material is lighter, the back end will be lighter, making the glasses overall unstable.

Don't choose an adjustable nose rest (fixed nose rest style). Slingshot hinge, do not choose a hinge, consider choosing a wide leg.

The curvature of the end of the mirror leg sleeve should be sufficient to hold the weight of the front end and do not choose a flat or slightly curved one. Check the data to obtain the degree, astigmatism, pupil distance, and axial position.