Glasses can be roughly divided into two categories: frame glasses and contact lenses. Frame glasses are further divided into myopia glasses, hyperopia glasses, presbyopia glasses, astigmatism glasses, sunglass near me, etc. Contact lenses refer to different types of contact lenses.

So, recognize and learn how to choose frame children's glasses that are suitable for your child. Frame glasses consist of a frame and lenses.

In terms of material, lenses have gone through three major development stages: natural crystal lenses, optical glass lenses, and optical resin lenses, and their functions and forms have also been constantly changing and upgrading.

Resin lenses are currently the most commonly used lenses on eyeglass mart due to their advantages of lightweight, nonfragility, high safety, easy processing, good chemical stability, and transparency.

The refractive index reflects the ability of a lens to refract light. Under the same conditions, the higher the refractive index value, the thinner and more beautiful the lens is, and of course, the more expensive it is.

High dispersion can cause colored stripes to appear at the edges of the viewed object. Traditionally, the Abbe number is used to reflect the dispersion force of lens materials, and the Abbe number is inversely proportional to the dispersion force of the material. The smaller the Abbe number, the greater the dispersion and the greater the impact on imaging quality.

Usually, high refractive index lenses are relatively thin but have high dispersion and poor visual quality. So, when choosing the refractive index of a lens, it is not simply pursuing a high refractive index, but choosing the appropriate lens based on one's eye condition.