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...

Full description

Saved in:
Bibliographic Details
Main Authors CHAUVEAU, JEAN-PIERRE, DECRETON, BRUNO, LE SAUX, GILLES
Format Patent
LanguageEnglish
French
German
Published 09.05.2007
Subjects
CONTACT LENSES
OPTICS
PHYSICS
SPECTACLES
SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES
Online AccessGet full text

Cover

More Information
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.
Bibliography:Application Number: EP20060290651