Method for determining an ophthalmic lens
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United States of America Patent
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Jan 17, 2017
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N/A
app pub date -
Nov 15, 2012
filing date -
Nov 16, 2011
priority date (Note) -
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Abstract
The invention relates to a method for determining an ophthalmic lens wherein: a first and a second reference axes are determined, the first reference axis is comprised between [γT−20°, γT+20° ] with γT being the mean axis of astigmatism over a first temporal portion, and the second reference axis is comprised between [γN−20°, γN+20° ] with γN being the mean axis of astigmatism over a second nasal portion; a combined reference axis is determined as a linear combination of the first and second reference axes; over the first portion, the sphere value along the combined reference axis is greater than the sphere value along a perpendicular axis to the combined reference axis; and over the second portion, the sphere value along the combined reference axis is greater than the sphere value along a perpendicular axis to the combined reference axis.
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