Multifocal ophthalmic lenses and related methods
AssigneeCooperVision International Limited
InventorsMartin Webber, Percy Lazon de la Jara
Life of this patent
Estimating the term…
Abstract
A multifocal ophthalmic lens wherein a first surface of the lens is shaped to form a surface power map and a second surface of the lens is shaped to form a second surface power map. The first surface power map and the second surface power map together form a lens power map. The first surface power map, the second surface power map, or the lens power map comprises a spiral. The spiral has a variation across at least a portion of the lens. Methods of making and using such lenses are also provided.
Claims17
A multifocal ophthalmic lens, wherein:
- a first surface of the lens is shaped to form a first surface power map;
- a second surface of the lens is shaped to form a second surface power map;
- the first and second surface power maps together form a lens power map;
- the first surface power map, the second surface power map, or the lens power map comprises a spiral, the spiral having a variation across at least a portion of the lens, wherein the spiral has a first periodic component with a period of greater than 100 microns in a radial direction extending outwards from the centre of the portion, and a second periodic component, in an azimuthal direction about the centre of the portion, and wherein the first and second periodic components vary smoothly as a sinusoid, a rounded square wave, or a square wave.
A method of manufacturing a multifocal ophthalmic lens, the method comprising:
- operating a lathe to shape a first surface of one of:
- a lens, a mould for a lens, or an insert for manufacturing a mould for a lens to form a first surface power map;
- operating a lathe to shape a second surface of the lens, mould, or insert to form a second surface power map;
- wherein:
- the combination of the first and second surface power maps forms a lens power map;
- the first surface power map, the second surface power map, or the lens power map comprises a spiral, the spiral having a variation across at least a portion of the lens, mould or insert, wherein the spiral has a first periodic component with a period of greater than 100 microns in a radial direction extending outwards from the centre of the portion, and a second periodic component, in an azimuthal direction about the centre of the portion, and wherein the first and second periodic components vary smoothly as a sinusoid, a rounded square wave, or a square wave.
Dependencies are inferred from the claim text.