Hologram
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United States of America Patent
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Issued Date -
Aug 8, 2013
app pub date -
May 19, 2011
filing date -
May 19, 2010
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Abstract
A substrate includes a diffracting structure providing a hologram which encodes one or more holographic images. Every image of the one or more holographic images has a holographic location at either a finite or substantially infinite effective optical distance. The hologram is to be used as an ophthalmic eye chart or an eye exercise device or to provide a scale for measuring distances.
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