| 摘要 |
A lens 1 for preventing myopia or reducing the progression of myopia, the lens comprising an optical portion 10 extending outwardly from a lens center to an outer periphery of the optical portion 10, the optical portion 10 having a central vision region 40 and a peripheral region, and a carrier portion 20 connected to the outer periphery of the optical portion 10 by a blending zone 30 of the carrier portion 20, the carrier portion 20 extending outwardly from the outer periphery of the optical portion 10 to an outer periphery of the carrier portion 20. The lens has a power profile that creates on-axis and off-axis myopic defocus to reduce or remove on-axis and off-axis defocus created by optics in the eye of a person wearing the lens, the profile creating the on-axis and off-axis defocus by providing an increase in positive (Plus) power for light rays passing through the central vision and peripheral regions of the optical portion. The power profile has a first increase in positive (plus) power that ranges from a minimum first positive (plus) power of about 0.5 diopters to a maximum first positive (plus) power of about 1.5 diopters over a radial distance from the lens center ranging from a first radial distance of about 1.5 mm to a second radial distance of about 3.0 mm. The power profile has a second minimum increase in positive (plus) power that is equal to the first maximum positive (plus) power at the second radial distance, and a second maximum increase in positive (plus) power that is at least 0.5 diopters greater than the first maximum positive (plus) power at a third radial distance, where the third radial distance is at least 0.5 mm greater than the second radial distance. |
