| 摘要 |
PROBLEM TO BE SOLVED: To provide a toric lens.SOLUTION: A toric lens includes: first and second surfaces located opposite from each other; two first sector zones, each having a first curvature on the first surface along a radial direction of the toric lens, the first curvature being constant along an arc direction of the toric lens; and two second sector zones alternately arranged with the two first sector zones, each second sector zone having a second curvature on the first surface along the radial direction, where the second curvature is constant along the arc direction and the first curvature is steeper than the second curvature. Since the first curvature is constant along the arc direction, a patient can still experience clear vision over a specific angle range even if the toric lens is rotated. A single toric lens can be suitable for different patients as long as they have astigmatism axes within the first sector zones. |
