| 摘要 |
In a diffractive multifocal ophthalmic lens capable of forming multiple focus points, in order to reduce blurred vision which may become problematic in distance vision in photopic environments in particular, a study of the mechanism of blurred vision was undertaken, and a diffractive multifocal ophthalmic lens which was found on the basis of a solution based on the study results and which has a novel structure capable of effectively decreasing blurred vision and improving quality of sight, and a method of producing the same, are provided. In this diffractive multifocal ophthalmic lens (10), a cancellation region which imparts an amplitude distribution for destructively decreasing the sideband, which is the main cause of blurred vision on the image surface in a focus point, is formed within a region in an optical area (12) that corresponds to the pupil diameter in a photopic state. |
