APPARATUS AND METHOD FOR DETERMINING VISUAL ACUITY OF A SUBJECT
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United States of America Patent
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Issued Date -
Jul 30, 2015
app pub date -
Aug 21, 2013
filing date -
Aug 24, 2012
priority date (Note) -
Abandoned
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Abstract
An apparatus (2) for providing a focussed visual state of a subject is disclosed. The apparatus comprises a fast focus switchable lens (6) for alternately focusing an image at (i) a first position at a first distance behind a second position and at (ii) a third position at a second distance in front of the second position, wherein the first distance is substantially equal to the second distance. A refraction correction lens system (12) adjusts the second position.
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