Spectacle lens
AssigneesHoya Lens Thailand Ltd., The Hong Kong Polytechnic University
InventorsChi Ho To, Siu Yin Lam, Takashi Hatanaka, Yasutake Masuda
Life of this patent
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Abstract
A spectacle lens can inhibit ametropia of the eyes and ensure full visibility. The spectacle lens comprises: first refraction areas and second refraction areas. Each first refraction area has a first refraction force that may be based on a prescription for correcting the ametropia of the eyes. Each second refraction area has a refraction force different from the first refraction force and may function to focus images on the positions except the retina of the eyes, to inhibit the development of the ametropia. Near the central part of the lens, the second refraction areas form a plurality of independent island-shaped areas, and the first refraction areas form the areas beyond the areas of the second refraction areas.
Claims20
A spectacle lens comprising:
- a first refraction area having a first refractive power based on a prescription for correcting an abnormal refraction of an eye;
- and
- second refraction areas having a refractive power different from the first refractive power, and having a function of focusing an image on a position other than a retina of the eye so as to suppress a progress of the abnormal refraction of the eye,
- the second refraction areas are non-concentrically formed as a plurality of respectively independent island-shaped areas near a center of the spectacle lens, the second refraction areas occupy less than 80% of a surface of the spectacle lens, and
- the first refraction area is formed as the area other than the areas formed as the second refraction areas.
Dependencies are inferred from the claim text.