Glasses are optical instruments worn on the human face, with dual attributes of decoration and refractive power (zero refractive power is flat light), as well as non-standard features. Strictly speaking, each pair of discount prescription glasses worn by the human eye is not the same!

The birth of a pair of glasses generally goes through the stages of optometry, frame selection, lens selection, processing and fitting, and trial and plastic surgery. The optometrist is responsible for the first three stages, while the fitting engineer is responsible for the last two stages, each taking on their responsibilities and completing the production of a pair of glasses.

A person's refractive index is not fixed. Under the guidance of the cheapest eyeglasses design, combined with the principle of binocular balance, the best prescription for glasses can be found: the lowest negative spherical mirror with the best vision (or the highest positive spherical mirror with the best vision); the Best visual acuity, best prism degree, and axial direction; Red and green are equally clear, with balanced eyes.

Choose a mirror frame based on the size of the pupil distance and the size of the face, and avoid being too capricious. Choosing a frame that is too large based on personal preference can result in adverse optical effects: prism effect!

There are many types of lenses suitable for different groups of people, with varying prices. Choosing the right lens for oneself: adolescent myopia prevention and control children's glasses lenses, suitable for children and adolescents, mainly to control the deepening of myopia; Anti-fatigue and anti-blue light lenses, suitable for friends who frequently play with their phones or surf the internet.