The instant application claims priority to Chinese Patent Application 202022864451.3, filed on Dec. 3, 2020, which is incorporated herein by reference.
The disclosure relates to the technical field of vision correction, in particular to a new type of contact lens.
As shown in
Known glasses are distinguished: contact lens and non-contact lens. The contact lens is the contact lens (42) that contacts the eyeball (20). The central area of the contact lens (42) is focused a corrected imaging (34), which is incident on the retina (24) to produces a clear image (32).
However, the peripheral area of the contact lens (42) with the same refractive power produces multiple peripheral unfocused vision (31). The focal points (33) and (35) of the peripheral unfocused vision (31) are behind the retina (24), forming blurred images. For see the image clearly, the axial length of the eyeball (20) is changed to let the focal points (33) and (35) can fall on the retina (24), which will damage the eyesight, such as increase myopia.
In view of this, the purpose of the present disclosure is to provide a new type of contact lens that uses a peripheral defocusing zone structure to prevent the user's vision from deteriorating.
In order to solve the above technical problems, the technical solution of the present disclosure is: a new type of contact lens, including a round lens (10), a base curve (18) is formed on the inner side of the lens (10), and the outer side of the lens (10) has a central optical zone (12), the central optical zone (12) has a diopter for correcting vision, a defocusing zone (14) is arranged on the outside of the lens (10), and the defocusing zone is arranged outside the central optical zone (12), the defocusing zone has a diopter capable of correcting vision.
The defocusing zone (14) is around the central optical zone (12) by concentric circles, and the defocusing zone (14) maintains a hyperopic diopter of +4.00D.
The defocusing zone (14) which is arranged around the central optical zone (12) by concentric circles, the defocusing zone (14) is provided with a plurality of zooming zones, and the plurality of zooming zones are also around the central optical zone (12) by concentric circles, so that the peripheral defocusing zone (14) has progressive diopters of hyperopia and myopia.
The diameter of the defocusing zone (14) ranges from 3 mm to 8 mm.
The partial defocusing zone (13) is next to the central optical zone (12), and the partial defocusing zone (13) maintains one diopter of myopia or hyperopia.
The partial defocusing zone (13) is a convex curved on the front side of the lens (10).
The edge of the base curve (18) connecting the lens (10) has a side shearing area (16).
The base curve (18) has a radius of curvature of 8-9 mm.
The diameter of the central optical zone (12) is about 3 mm.
The technical effect of the disclosure is mainly by adopting the structure of the defocusing zone, and the defocusing zone has the diopter of hyperopia or myopia with the central optical zone (12) for correcting vision, which is different from the central optical zone (12), but can prevent the eye axis become longer, prevents the user's vision from deteriorating.
The specific embodiments of the present disclosure will be described in further detail below in conjunction with the accompanying drawings, so as to make the technical solution of the present disclosure easier to understand and grasp.
As shown in
As shown in
In the figure, the central optical zone (12) is a convex curved surface on the outside of the lens (10), and the convex curved surface makes the central optical zone (12) have a diopter. According to the formula D=1/f, it means that the diopter (D) is the reciprocal of the focal length (f). For example, if the focal length is 15 m, the diopter is 1/15. Traditionally, the diopter is multiplied by 100 to convert to a glasses diopter. For example, the central optical zone with a diopter of −3.75 D, a negative number (−) of the diopter, represents a diopter of 375 for correcting the myopia. Assuming that the diopter of the central optical zone (12) is +1.00 D, a positive (+) of the diopter, represents a diopter of 100 for correcting hyperopia. Therefore, the central optical zone (12) enables the lens (10) to correct myopia, hyperopia, or astigmatism.
In addition, the peripheral defocusing zone (14) is also a convex curved surface on the outside of the lens (10), and the convex curved surface keeps the defocusing zone constant at +4.00 D (hyperopia) diopter.
As shown in
At the same time, external light is refracted to the peripheral defocusing is zone (14) of the lens (10) through the object (40), and multiple peripheral defocus lights (30) are generated by the diopter of the hyperopia, which are focused in front of the retina (24) to form multiple focal points (36) and (38). The lens (10) is equipped with bifocals. So the axial length of the eyeball (20) does not need to be excessively elongated when users see the image clearly, and the deterioration of vision can be prevented more than in the prior art.
Under the condition of equal diameter, the peripheral defocusing zone (14) is composed of a plurality of concentric circular circle areas. From the central optical zone (12) to the edge of the lens (10), these circle areas are defined as the first zoom zone a, the second zoom zone b, the third zoom zone c, the fourth zoom zone d, and the fifth zoom zone e , between of each other are regarded as the radius distance S1, S2, S3, S4, S5.
For example, the first zoom zone a with a radius distance S1 of 2 mm surrounds the central optical zone (12); the second zoom zone b is an annular zone with a radius distance S2 of 2 mm, which surrounds the first zoom zone a; The third zoom zone c with a radius distance S3 of 2 mm, surrounds the second zoom zone b; the fourth zoom zone d is a circle area with a radius distance S4 of 2 mm, surrounds the third zoom zone c; the radius distance S5 The fifth zoom zone e of 2 mm surrounds the fourth zoom zone d.
The “multifocal” here generally refers to the focus of multiple diopters may all be the hyperopia, or myopia, or these diopters may be multiple focal points of hyperopia or myopia.
To put it simply, the diopters of the five zoom zones are all positive (+), so that the peripheral defocusing zone (14) has five focal points with different hyperopia powers; or, the diopters of the five zoom zones are all negative (−) , Let the peripheral defocusing zone (14) maintain five focal points with different myopia powers; or, the diopter of the zoom zone is alternately positive (+) and negative (−), Example in the first zoom zone a of the myopia, will just between the central optical zone (12) and the second zoom of hyperopia zone b; or, the fourth zoom zone d with the hyperopia, between the third zoom zone c and the fifth zoom zone e of the myopia. In this way, the peripheral defocusing zone (14) with progressively multifocal continuously changes the focus of the light incident on the eyeball, and the user wearing the lens (10) is trained to restrain the eye axis from being excessively elongated.
Number | Date | Country | Kind |
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202022864451.3 | Dec 2020 | CN | national |