Multifocal ophthalmic lens for dim-lighting conditions
AssigneeAllergan, Inc.
InventorValdemar Portney
Life of this patent
Estimating the term…
Abstract
A multifocal ophthalmic lens, having outer annular zones with vision correction powers less than a far vision correction power of the patient, is disclosed. These additional annular zones come into play, when the pupil size increases under dim lighting conditions, to thereby compensate for the near-vision powered annular zones. The net effect of the additional near vision annular zones and the additional annular zones having power less than the far vision correction power is to shift the best quality image from in front of the retina to an area on the retina of the eye, to thereby reduce halo effects and improve image contrast.
Claims20
A multifocal ophthalmic lens for providing vision correction powers, the multifocal ophthalmic lens being adapted to be implanted in an eye or to be disposed in a cornea and having a baseline diopter power for far vision correction, the multifocal ophthalmic lens comprising:
- a central zone having a vision correction power approximately equal to or greater than the baseline diopter power, the central zone having a progressive power region in which the vision correction powers vary progressively;
- a first outer zone located radially outwardly of the central zone and having a vision correction power greater than the baseline diopter power;
- and
- a second outer zone located radially outwardly of the first outer zone and having a substantially constant diopter power, which is less than the baseline diopter power.
A multifocal ophthalmic lens for providing vision correction power, the multifocal ophthalmic lens being adapted to be implanted in an eye or to be disposed in a cornea and having a baseline diopter power for far vision correction, the multifocal ophthalmic lens comprising:
- central zone having a vision correction power approximately equal to or greater than the baseline diopter power, the central zone having a progressive power region in which the vision correction power varies progressively;
- a first annular zone located radially outwardly of the central zone and having a vision correction power greater than the baseline diopter power;
- and
- a second annular zone located radially outwardly of the first annular zone and having a substantially constant vision correction power, which is less than the baseline diopter power.
A multifocal ophthalmic lens for providing vision correction power, the multifocal ophthalmic lens having a periphery and having a baseline diopter power for far vision correction, the multifocal ophthalmic lens being adapted to be implanted in an eye or to be disposed in a cornea, and comprising:
- a central zone having a vision correction power approximately equal to or greater than the baseline diopter power, the central zone having a progressive power region in which the vision correction power varies progressively;
- a first zone having a near vision correction power, the first zone being located radially outwardly of the central zone;
- and
- a second zone located radially outwardly of the first zone and having a substantially constant vision correction power, which is less than the baseline diopter power.
A multifocal ophthalmic lens for providing vision correction power and adapted to be implanted in an eye or to be disposed in a cornea, the multifocal ophthalmic lens comprising:
- a central zone having a vision correction power, which is greater than or equal to a baseline diopter of the multifocal ophthalmic lens, the central zone having a progressive power region in which the vision correction power varies progressively;
- and
- an annular zone circumscribing the central zone and having a substantially constant vision correction power, which is less than the baseline diopter power.
Dependencies are inferred from the claim text.