Translating presbyopic contact lens pair

摘要

Translating, multifocal contact lens pairs with optical power zones which are dissimilar between the first and second lenses of the pair are utilized for correcting presbyopia in the wearer. Each lens may differ in segment height, power, asphericity, shape, orientation and/or inset of the optical power subzones thereby providing clear and comfortable vision at far, intermediate and near distances.

主权项

1. A translating contact lens pair for treating presbyopia comprising:
a first contact lens including an optical zone having at least one distance vision subzone above a horizontal meridian of the first contact lens, at least one near vision subzone below a horizontal meridian of the first contact lens and at least one intermediate vision subzone, a peripheral zone and an edge zone and having a first set of optical zone features with a first set of values for the features, the first set of optical zone features includes segment height, power, asphericity, shape, orientation and inset, the peripheral zone is positioned radially outwards from the optical zone and comprises features that enable lens translation; and a second contact lens including an optical zone having at least one distance vision subzone above a horizontal meridian of the second contact lens, at least one near vision subzone below a horizontal meridian of the second contact lens and at least one intermediate vision subzone, a peripheral zone and an edge zone and having a second set of optical zone features with a second set of values for the features, the second set of optical zone features includes segment height, power, asphericity, shape, orientation and inset, wherein at least one of segment height, power, asphericity, shape, orientation and inset in the first set of optical power zone features is different than at least one of segment height, power, asphericity, shape, orientation and inset in the second set of optical power zone features, and wherein the optical zone of each contact lens is asymmetric about the vertical meridian of the contact lens, the peripheral zone is positioned radially outwards from the optical zone and comprises features that enable lens translation, wherein the physical position of the near and intermediate subzones within the optical zone in the first lens is different from the physical position of the near and intermediate zone within the optical zone of the second lens thereby creating an asymmetry of the near and intermediate subzones between the two lenses.