Eye covering and refractive correction methods and apparatus having improved tear flow, comfort, and/or applicability
US9740025B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 2014 |
| Grant date | Aug 22, 2017 |
| Priority date | — |
| Expiry date | Aug 25, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/047
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An eye covering such as a contact lens may comprise one or more structures to pump tear liquid under the covering such that the covering can remain in the eye and correct vision for an extended amount of time. In many embodiments, the covering comprises a material having fenestrations to draw tear liquid under the covering and an outer portion shaped to contact the conjunctiva over the sclera, such that when the eye closes pressure of one or more eyelids urges tear liquid through one or more fenestrations and under the outer portion shaped to contact the conjunctiva. When the eye blinks, the pressure of the one or more eyelids can urge the covering toward the cornea such that tear liquid can pass through the fenestrations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.