Annular trifocus and bifocus spectacle lens

Abstract

The invention relates to an annular trifocus and bifocus spectacle lens belonging to the technical field of spectacles. The surface shape of each of the spectacles comprises three independently main visual areas: a long distance visual area, a middle distance visual area and a near distance visual area, wherein the part of the long distance visual area located in the center of the spectacle is round; annular sub regions are successively connected from inside to outside; an inner ring arc centripetal distributive concentric circle is established around the long distance visual area and shares ageometrical optical center. Distances and refractive diopters which are different are set among the radius and the long distance visual area and the annular sub regions at intervals. The refractive diopters are arranged individually, the refractive diopter of the long distance visual area is arranged according to 81cm to 5m from a long distance meter subjective refractive diopter, the refractivediopter of the middle distance visual area is arranged according to 41cm to 80cm from a long distance meter subjective refractive diopter, and the refractive diopter of the near distance visual area is arranged according to 33cm to 40cm from a long distance meter subjective refractive diopter. Long, middle and near excellent eyesight can be obtained. The annular trifocus and bifocus spectacle lensis worn by people with presbyopia and juvenile myopia.

Description

technical field [0001] The invention relates to the technical field of eyeglasses. More specifically, the spectacle lens provides concentric circles with excellent vision in the distance, middle and short distances, and is customized according to the subjective optometry of individual opticians. Background technique [0002] As the population ages, vision correction for presbyopia has become one of the global concerns. Regardless of whether the elderly are emmetropic or nearsighted, different degrees of correction are required to see objects clearly at long distances, intermediate distances or close distances. Progressive multifocal lenses have become the main lens for vision correction of the elderly. This kind of glasses uses gradual diopters between the far vision area and the near vision area to obtain fresh distance vision and near vision. The vision correction effect in the middle distance area is not good. At the same time, it also brings irregular astigmatism on the...

AI Technical Summary

Problems solved by technology

These designs use the same ring spacing, and the positive bonuses are evenly distributed in each ring area from the inside to the outside. There is no independent middle-distance viewing area and near-distance viewing area. need

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