CN114137742A

CN114137742A - Prism lens

Info

Publication number: CN114137742A
Application number: CN202010923382.0A
Authority: CN
Inventors: 陈迪生
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-04
Filing date: 2020-09-04
Publication date: 2022-03-04
Anticipated expiration: 2040-09-04
Also published as: CN114137742B

Abstract

The invention discloses a prism lens which comprises a prism power progressive area and a non-prism area, wherein the prism power progressive area comprises an optical area and a non-optical area. After the progressive prism lens is used, human eyes do not need to cater to various light rays with different object distances through eyeball cohesion because the refraction degrees of different prism degrees are different. Therefore, when the human eyeball watches objects at different distances, the eyeball can not generate obvious cohesion, thereby leading to the increase of intraocular pressure.

Description

Prism lens

Technical Field

The invention relates to a prism lens.

Background

As shown in fig. 1, human studies have demonstrated that when two eyes see a distant object, two eyes of a human being look straight at the object at infinity, and at this time, visual axes of two eyeballs of the human body are parallel and at a basic eye position without rotation, and eye muscles are in a relatively relaxed state.

See fig. 2. When a user looks at a relatively close object, the two eyes need to rotate inwards (between the two eyes), and the user can see the object clearly after focusing; in this case, the extraocular muscles of both eyeballs are relatively tense, causing a relative increase in intraocular pressure, and if the intraocular pressure is high for a long time, the choroid is displaced backward, causing a thinning of the choroid, resulting in a decrease in blood flow of the choroid, a decrease in oxygen supply and nutrient supply to the sclera, affecting scleral fibers, causing a decrease in the tension of the scleral fibers, and when the intraocular pressure is increased, causing the eyeballs to balance the intraocular pressure by the increase of the ocular axis, and the scleral to have a decreased pressure resistance. Eventually leading to myopia.

See fig. 3. In order to prevent myopia, a single prism with only one prism degree is invented by people, the purpose is to enable the eyes to see the far eye position when the eyes see the near eye position, but the effect of the lens with the single prism degree on preventing the myopia is not obvious for a long time. The inventor finds that the main reason for the unobvious effect is because the lens has only one prism, and the prism with single prism solves the problem that the eyeball of the human is close to cohesive state, but leads to the outward expansion state of the eyeball when the eyeball of the human is far away, and the cohesion and the outward expansion cause the intraocular pressure to be increased. Because the light of the object is straight, the included angles of the light of the object at different distances are different on the premise that the light enters the eyeball and focuses on the macula lutea of the retina. After the single-prism-degree prism is worn, the object light at a certain distance can only be ensured to enter the eyeball and be focused on the retina yellow class when the eyeball is at the basic eye position, and the eye position of the eyeball of the human does not need to be adjusted to meet the entrance of the object light.

The eye using habit of people is closely related to our life and work, and when people open eyes, the eyes of people can focus on objects at different distances according to different requirements, and the eyes cannot be focused on the objects at a certain distance. In a normal state, when the human eyeball looks at objects with different distances, different light included angles are formed, when people look at a distance, the cohesion is reduced, and the included angle is reduced; when the patient looks close, the cohesion is increased and the included angle is increased. After a specific single-prism-degree prism is added, when a user looks at a close place, the cohesion is reduced, and the included angle is reduced; but when looking at a distance, the eyes become everted (abducted) separately. Regardless of whether the eye is cohesive or abductive, the extraocular muscle tone is relatively increased relative to the base eye position of the eye, resulting in increased intraocular pressure. Therefore, the effect for controlling myopia is not good.

Disclosure of Invention

In order to overcome the technical defects, the invention provides a progressive prism lens, which comprises a thin edge and a thick edge, and a prism shaft, wherein the prism shaft is a connecting line from the thinnest point of the thin edge to the thickest point of the thick edge through a circle center (an optical center), and the axis can be a straight line or a curve. There are numerous points on the prism axis, the prismatic power of a line perpendicular to the prism axis passing through a point is uniform, and the prismatic power of two adjacent points is not uniform. The prism power gradually increases along the prism axis direction.

Drawings

Fig. 1 is a schematic view of the base eye position of an eyeball.

Fig. 2 is a schematic diagram of an eye position of an eyeball viewing a closer distance object.

Fig. 3 is a schematic view of an eyeball viewing objects at different distances through a single prism lens.

Fig. 4 is a top view of a prismatic lens of the present invention.

FIG. 5 is a cross-sectional view of a prismatic lens of the present invention.

FIG. 6 is a schematic diagram illustrating the prism power progression of the prism lens of the present invention.

Fig. 7 is a schematic view of an eyeball viewing a near-far object through a prism lens of the present invention.

In the figure, 1 is a non-prism area, 2 is a prism progressive area, 21 is an optical area, 22 is a non-optical area, 3 is a macula lutea, an AB connecting line is a prism axis, L1-L5 is a line vertical to the prism axis, P1-P5 are intersection points of the line and the prism axis, T1 is an infinite object, an object with a distance of T2, an object with a distance of T3, a light ray of LA T1 entering an eyeball, a light ray of LB T2 entering the eyeball, and a light ray of LC T3 entering the eyeball.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.

The invention provides a prism lens with gradually changing prism degree, and referring to fig. 4, an AB connecting line is a prism axis. The AB line passes through the point C of the circle center, and the prism power of the lens along the prism axis is gradually increased from the point A to the point B, and the diopter is unchanged. Point a is the thinnest point of the lens and point B is the thickest point of the lens. The area 1 near the point A is a non-prism area, and the middle area 21 and the area 22 near the point B are both prism degree progressive areas 2, wherein the area 21 is an optical area, and the area 22 is a non-optical area. Referring to fig. 5, a cross-sectional view of the prism axis along line AB, where a is the thinnest point and B is the thickest point of the mirror plate.

Referring to fig. 6, L1, L2, L3, L4 and L5 are lines perpendicular to the prism axis AB, intersect with the prism axis AB at P1, P2, P3, P4 and P5, the prism power of each point on the line of L1 is the same as that of P1, the prism power of each point on the line of L2 is the same as that of P2, and so on, the prism power of each point on the line of L5 is the same as that of P5. The prism degrees of the traditional prisms at points P1, P2, P3, P4 and P5 are the same, and the result is that P1 is P2 is P3 is P4 is P5. In the progressive prism designed by us, the prism degree of each point of P1, P2, P3, P4 and P5 is different, and the prism degree is P1 < P2 < P3 < P4 < P5.

Referring to fig. 7, after a progressive prismatic power prism is added in front of the eyeball, a light ray LA of an object T1 at infinity enters both eyes in parallel and is focused on the macula lutea 3 of the retina; the light ray LB of the object T2 at the intermediate distance passes through the progressive prism (the prism of the region into which the light ray LB enters is higher than the prism of the region into which the light ray LA enters), and the eyeball does not need to change the eye position significantly (relative to the eye position in fig. 2) to cater for the light ray LB entering the eyeball; the light LC of the object T3 at the near distance passes through the progressive prism (the prism of the area where the light LC enters is higher than that of the area where the LB enters), and the eyeball does not need to change the eye position significantly to cater for the light LC entering the eyeball.

The prism degrees of P1, P2, P3, P4 and P5 points in the prism axis direction are P1 < P2 < P3 < P4 < P5, and the like. The points P1, P2, P3, P4 and P5 are positions of eyeball cohesion when the human eyes see objects at different distances. Compared with the points P1, P2, P3 and P4, the point P5 is the position where the eyeball is converged and caters to the light entering the eyeball when an object is closest to the human eye. After the prism lens with the progressive prism power is used, human eyes do not need to cater to various light rays with different object distances through eyeball cohesion because the refraction degrees of different prism powers are different. Therefore, when the human eyeball watches objects at different distances, the eyeball can not generate obvious cohesion, thereby leading to the increase of intraocular pressure.

The above-mentioned embodiments only express some embodiments of the present patent, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present patent protection. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the patent concept, which falls within the scope of protection of the patent. Therefore, the protection scope of this patent shall be subject to the appended claims.

Claims

1. A prism lens, comprising a power progressive area and a non-prism area, wherein the power progressive area comprises an optical area and a non-optical area.

2. The prism lens of claim 1, wherein the prism power of the prism power progressive area is smallest in an area where the prism power progressive area is intersected with the non-prism area, and the prism power is higher as it is farther from the non-prism area.

3. The prism sheet of claim 1, wherein the prism sheet has the same or a slight change in the prism from top to bottom in a direction perpendicular to the direction from the prism power progressive area to the non-prism area.