Diffraction-type multifocal ophthalmic lens and manufacturing method thereof
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United States of America Patent
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Feb 7, 2017
Grant Date -
Nov 27, 2014
app pub date -
Feb 9, 2012
filing date -
Feb 9, 2012
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Abstract
Provided is a diffraction-type multifocal ophthalmic lens for which halos are reduced. Also provided is a diffraction-type multifocal ophthalmic lens having three or more focal points, which is implemented on the basis of the discovery that the diffraction-type multifocal ophthalmic lens has a characteristic whereby multiple focal points can be generated in the intermediate region as well as the near and far regions. Also provided is a method for manufacturing a diffraction-type multifocal ophthalmic lens which provides a simple design and manufacturing method by means of a simple diffraction structure and by replacing a cumbersome computer simulation with a simple method. This diffraction-type multifocal ophthalmic lens has a diffraction structure (20) where a plurality of diffraction zones are formed concentrically on the lens (10), and an equal-pitch region is provided where pitches of at least two zones among the diffraction zones are made equal.
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