Patent Application
20190179167
The subject matter herein generally relates to a progressive addition lens, and a progressive addition glasses using the progressive addition lens.
Progressive addition lenses are usually described as having three zones: an upper zone for far vision, a lower zone for near vision, and an intermediate progression corridor that bridges the first two zones. People wearing the progressive addition lens can achieve a continuous clear vision from a far point to a near point. However visual acuity of the existing progressive addition lens is low. Thereby a progressive addition lens with a high visual acuity is needed.
Implementations of the present disclosure will now be described, by way of example only, with reference to the attached figures.
It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale, and the proportions of certain parts may be exaggerated to illustrate details and features of the present disclosure better. The disclosure is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings, in which like references indicate similar elements. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean “at least one.”
The term “comprising” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series, and the like. The term “about” when utilized, means “not only includes the numerical value, but also includes numbers closest to the numerical value”.
The first lens layer 10, the second lens layer 20, and the third lens layer 30 are made of different materials. A refractive index of the first lens layer 10, a refractive index of the second lens layer 20, and a refractive index of the third lens layer 30 are all different, thus a visual acuity of the progressive addition lens 100 is high.
The first lens layer 10 is made of solid material. The solid material may be selected from polycarbonate, cyclic block copolymer (CBC), polymethyl methacrylate (PMMA), or any combination thereof.
The second lens layer 20 is made of solid material, liquid material, gas material, or any combination thereof. The solid material may be selected from polycarbonate, cyclic block copolymer (CBC), polymethyl methacrylate (PMMA), or any combination thereof. The liquid material may be selected from water, silicone oil, or combination thereof. The gas material may be selected from air, oxygen, nitrogen, or any combination thereof.
The third lens layer 30 is made of solid material. The solid material may be selected from polycarbonate, cyclic block copolymer (CBC), polymethyl methacrylate (PMMA), or any combination thereof.
In at least one exemplary embodiment, the progressive addition lens 100 further includes at least one coating layer 40. The at least one coating layer 40 is attached on the front surface 110 and/or the back surface 120.
The coating layer 40 may be an anti-scratch layer, an anti-reflection layer, an anti-fog layer, an anti-dust layer, a water-repelling layer, or an anti-UV layer.
The progressive addition lens 100 includes a front surface 110, and a back surface 120 opposite to the front surface 110. The front surface 110 may be a spherical surface or an aspherical surface. The back surface 120 may be a spherical surface or an aspherical surface.
In at least one exemplary embodiment, a thickness of the first lens layer 10, a thickness of the second lens layer 20, and a thickness of the third lens layer 30 are equal. In other exemplary embodiment, the thickness of the first lens layer 10, the thickness of the second lens layer 20, and the thickness of the third lens layer 30 are not equal.
A shape of the cavity 101 is not limited. In at least one exemplary embodiment, the cavity 101 has a cuboid shape.
The cavity 101 includes at least one cavity wall 1011. The cavity wall 1011 may have a shape of flat surface or a curved surface.
It is to be understood, even though information and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the present embodiments, the disclosure is illustrative only; changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the present embodiments to the full extent indicated by the plain meaning of the terms in which the appended claims are expressed.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201711329520.7 | Dec 2017 | CN | national |
