Patent Publication Number: US-2019179167-A1

Title: Progressive addition lens and progressive addition glasses

Description:
FIELD 
     The subject matter herein generally relates to a progressive addition lens, and a progressive addition glasses using the progressive addition lens. 
     BACKGROUND 
     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. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Implementations of the present disclosure will now be described, by way of example only, with reference to the attached figures. 
         FIG. 1  is a diagrammatic view of a progressive addition lens according to an exemplary embodiment of the present disclosure. 
         FIG. 2  is a cross-sectional view taken along line II-II of  FIG. 1  according to a first exemplary embodiment of the present disclosure. 
         FIG. 3  is a cross-sectional view taken along line II-II of  FIG. 1  according to a second exemplary embodiment of the present disclosure. 
         FIG. 4  is a diagrammatic view of a progressive addition glasses according to an exemplary embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     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”. 
       FIG. 1  illustrates a progressive addition lens  100  including a first lens layer  10 , a second lens layer  20  attached to a surface of the first lens layer  10 , and a third lens layer  30  attached to a surface of the second lens layer  20  away from the first lens layer  10 . 
     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. 
       FIG. 2  illustrates a first embodiment of a progressive addition lens  100   a . The second lens layer  20  of the progressive addition lens  100   a  is made of solid material. The first lens layer  10 , the second lens layer  20 , and the third lens layer  30  are stacked one after another. 
       FIG. 3  illustrates a second embodiment of a progressive addition lens  100   b . The second lens layer  20  of the progressive addition lens  100   b  is made of liquid material or gas material. The first lens layer  10  and the third lens layer  30  form a cavity  101 . The liquid material or the gas material is filled in the cavity  101 , to form the second lens layer  20 . 
     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. 
       FIG. 4  illustrates a progressive addition glasses  200 . The progressive addition glasses  200  includes a glasses frame  201 , and two progressive addition lenses  100  embedded on the glasses frame  201 . 
     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.