Multifocal ophthalmic lens having a focal point formation region and a cancellation region and manufacturing method thereof
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United States of America Patent
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May 23, 2017
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app pub date -
Feb 6, 2013
filing date -
Feb 9, 2012
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Abstract
In order to reduce halos that occur in multifocal ophthalmic lenses, the mechanism of the phenomenon was elucidated and a solution was found based on the results. Thus provided are a multifocal ophthalmic lens having a structure and a manufacturing method for the same which can effectively reduce halos. A multifocal ophthalmic lens having a focal point formation region provided to an optical portion of a lens, which forms at least two focal points, wherein a cancellation region is provided to the optical portion, the cancellation region providing diffracted light of an amplitude distribution that reduces, on the image plane of the first focal point among the focal points, the amplitudes of light other than the light that forms the first focal point.
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