Dynamic defocus ring construction to improve myopia control

Abstract

This invention is a dynamic defocus ring structure for improving myopia control. It mainly includes a lens body with a central optical zone in the center and a peripheral vision control zone around the central optical zone. The peripheral vision control zone is further divided into multiple vision correction segments through transition sections. Each vision correction segment can be designed with functional parameters such as a defocus segment, coma segment, trilobal aberration segment, or peripheral defocus segment. Through the principle of geometric continuity design, the transition section has the continuity of tangent and curvature, which can ensure smooth connection and stable function between different segments. With this multi-segment coexistence design, this invention can provide personalized lens configuration for different individual eye structures and higher-order aberration characteristics, providing a correction control lens with multi-target control, high degree of freedom, and high stability.

Claims

1. A dynamic defocus ring structure for improving myopia control, comprising a lens body, wherein: The lens body has a central optical zone for focusing the line of sight in the center, and a peripheral vision control zone is arranged around the central optical zone. The peripheral vision control zone has multiple vision correction segments in an arc shape. A transition segment with different curvatures is provided between each vision correction segment to reduce the discontinuity between the vision correction segments and ensure a smooth transition between different areas.

2. The dynamic defocus ring structure for improving myopia control as described in claim 1, wherein the arc surfaces between the two adjacent vision correction segments of the lens body are formed by a first tangent and a second tangent extending to form intersecting arc tangent points, and the two arc tangent points extend upwards to form a first included angle line and a second included angle line with equal side lengths, thereby obtaining an included angle between the first included angle line and the second included angle line, and a shortest distance is formed between the two arc tangent points, and the curvature transition segment of the transition segment can be calculated by substituting the shortest distance between these vision correction segments into the geometric relationship of the included angle.

3. The dynamic defocus ring structure for improving myopia control as described in claim 2, wherein the transition section of the lens body is a functional area occupied between different regions by minimizing the transition section. The geometric relationship between the two vision correction sections is calculated by the formula R = L ÷ [2 × sin(θ ÷ 2)]. The objective function for minimizing the radius of the transition section is derived through this formula to satisfy the continuity conditions of the tangent and curvature of each region, so as to ensure a smooth transition between different regions. Here, L is the length of the shortest distance, and θ is the angle of the included angle. The obtained R value is substituted into the curved surface formed by the curvature transition section.

4. The dynamic defocus ring structure for improving myopia control as described in claim 1, wherein the vision correction segments of the lens body can be optically divided into defocus segments, coma segments, trilobal aberration segments and peripheral defocus segments according to different vision correction needs.

Images