Partial thin layer multi-focus glasses

Abstract

The invention discloses a local thin layer multi-focus spectacle lens, which is composed by attaching at least one auxiliary lens with focus power and the thickness not higher than 2mm at the inner part or the surface locally of a main spectacle lens which has no focus power or has single focus. The auxiliary lens is embedded in the main spectacle lens which refraction index is different from the main spectacle lens of at least 0.1. The invention can produce the products such as dual-focus sunglasses, gate glasses and near oriented double-focus spectacle lens and the like to expand the varieties of multi-focus spectacle lenses, and can form simple Franklin double-focus spectacle lens and simple progressive spectacle lens, to support the application and popularization of double-focus spectacle lenses and progressive spectacle lenses. The invention further discloses a production method and a manufacture processing for serial local thin layer multi-focus spectacle lenses.

Description

technical field [0001] The invention relates to spectacle lenses, in particular to partial thin-layer multifocal spectacle lenses, and to near-standard bifocal spectacle lenses. Background technique [0002] With age, the adjustment ability of the human eye gradually decreases until it is lost. Although this does not affect the distance vision, it must have sufficient adjustment ability for near vision, so the middle-aged and elderly people will inevitably suffer from presbyopia. Not only middle-aged and elderly people, but anyone who uses one pair of glasses for distance vision and another pair of glasses for near vision, the two pairs of glasses must be different. Analyzing the distance lens prescriptions and near lens prescriptions issued by ophthalmologists to the same person, we will find that: ignoring some small differences, such as the difference in astigmatism, the most significant difference between the two is that the focal power of the near lens is greater than t...

AI Technical Summary

Problems solved by technology

[0003] At present, the awareness of multi-focal glasses in the majority of areas except developed areas is still very poor, let alone popularized.

There are reasons for the level of economic and social development and the mode of operation of the optical industry. The reason for this is that there are few types of multi-focal glasses available, and the applicable fields have not been expanded as they should be, such as sunglasses. There is no bifocal sunglasses that can take into account both distance and near; the fitting of existing multifocal glasses is cumbersome and time-consuming, it is best to configure two pairs to adapt to different usage occasions, and re-fitting is required after the service life is exceeded, which often greatly reduces interest; Focal glasses have always been expensive, technically speaking, because the previous bifocal glasses were complicated in technology, and the production process did not pay more attention to the compatibility with the mature technology of traditional single-focus glasses. Customers are customized one by one with differences, and special equipment is used for each customer, so the price is higher

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