Variable focus lens with internal refractive surface
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United States of America Patent
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Issued Date -
Jan 1, 2004
app pub date -
Jul 1, 2002
filing date -
Jul 1, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An improvement for liquid-filled variable focus lenses for eyeglasses. The invention is applicable to lenses of the type having a rigid lens, a distensible membrane, liquid filling the space between the rigid lens and the membrane, and some means for causing the liquid to press against and distend the membrane. The improvement comprises fabricating the rigid lens from material that has a substantially higher index of refraction than does the liquid filling, and shaping the rigid lens to provide an additional positive refractive surface. The positive optical power so provided reduces the required curvature on the exterior of the rigid lens so that this exterior curvature can be concave, even for hyperopic corrections.
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