Ophthalmic lens
The lens has a power addition prescription and a complex surface presented with a fitting cross. A far vision zone has a control point, and a near vision zone has a control point and an intermediate vision zone. A principal meridian of progression passes via the three zones. A reduced root mean squa...
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Main Authors | , , |
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Format | Patent |
Language | English French German |
Published |
09.05.2007
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Subjects | |
Online Access | Get full text |
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Summary: | The lens has a power addition prescription and a complex surface presented with a fitting cross. A far vision zone has a control point, and a near vision zone has a control point and an intermediate vision zone. A principal meridian of progression passes via the three zones. A reduced root mean square deviation is normalized to the addition prescription of less than a specific decimal value of microns per dioptre over a zone that includes the far vision control point. A progression length is defined as an angle of lowered viewing from the fitting cross down to the point on the meridian. An independent claim is also included for a method of correcting the vision of a presbyopic subject. |
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Bibliography: | Application Number: EP20060290651 |