Intraocular lens for correcting corneal coma
US8801781B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2005 |
| Grant date | Aug 12, 2014 |
| Priority date | — |
| Expiry date | May 28, 2030 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2/1613
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
When fitting a patient for an intraocular lens, a series of measurements is taken on the patient's eye that determines a required lens power. Next, a range of preferred shape factors may be found, which determine the base (i.e., spherical) radii of the two lens surfaces, essentially independent of the lens power. The preferred shape factor adjusts the third-order coma of the lens to largely offset the coma of the cornea, so that the image at the retina has a reduced amount of third-order coma. Once a preferred shape factor is determined, the base radii of curvature of the anterior and posterior surfaces are determined from the shape factor and the lens power by algebraic formulas. Finally, one or more aspheric terms are added to one or both of the surfaces in the lens, so that the spherical aberration of the lens largely offsets the spherical aberration of the cornea.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.