Abstract: Disclosed is a manufacturing method for a free toric lens, which improves the degree of freedom through point-by-point optimization of a plurality of meridians with different angles in an entire plane. The manufacturing method includes the following steps: S1: constructing a simplified lens-eye model; and S2: determining a focal power F2 and a curvature radius r20 of a vertex. Free toric coefficients of vertical and horizontal meridians are calculated; then due to the rotation symmetry of the lens, it is only considered that in a first quadrant of a curved surface, and the curved surface shape of a free toric surface is determined according to rise data of each point on the taken meridians, so that the manufactured lens is thinner, and clearer in imaging.

Abstract: A front curve design method for preparing a resin lens with a high refractive index. The method includes within a myopia power range of ?1.00 to ?15.00, designing the maximum design front curve to be ?4.00 D from ?1.00 to ?3.50; designing the maximum design front curve to be ?3.00 D from ?3.75 to ?5.50; designing the maximum design front curve to be ?2.00 D from ?5.75 to ?8.75; and designing the maximum design front curve to be ?1.50 D from ?9.00 to ?15.00. The method of the present invention is mainly suitable for resin lenses with a refractive index of 1.60, 1.67 or 1.74.

Abstract: Disclosed in the present disclosure is an eyeglass lens for preventing and controlling myopia. The eyeglass lens includes a lens body, the lens body includes a first area, a second area, and third areas, the first area is a regular area formed with an optical centre of the lens body as a centre, the first area has a refractive power with a myopia correction function, the second area is a peripheral area of the lens body, and the second area is used for focusing an image on a position in front of a retina of an eye, to inhibit myopia development of the eye.

Abstract: A spectacle lens includes a first region having a refractive power for ametropia based on corrected visual acuity; and a second region having an unfocused imaging function; the first region and the second region being disposed on a lens surface, the second region including a plurality of sub-regions independent of each other, and the first region being a region on the lens surface other than the second region; wherein the first region has a function of focusing an image on the retina of an eye while correcting the ametropia, and the second region has a function of limiting image focusing, whereby the combination of both inhibits or slows down development of myopia and hyperopia by limiting imaging in front of or behind the retina by the second region while visually distinguishing the image of an object formed by the first region.

Abstract: A front curve design method for preparing a resin lens with a high refractive index. The method includes within a myopia power range of ?1.00 to ?15.00, designing the maximum design front curve to be ?4.00 D from ?1.00 to ?3.50; designing the maximum design front curve to be ?3.00 D from ?3.75 to ?5.50; designing the maximum design front curve to be ?2.00 D from ?5.75 to ?8.75; and designing the maximum design front curve to be ?1.50 D from ?9.00 to ?15.00. The method of the present invention is mainly suitable for resin lenses with a refractive index of 1.60, 1.67 or 1.74.