Contact lens cleaning compositions with particles of variable hardness and processes of use
US5580392A · kind A · utility
8Cited by
33References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1994 |
| Grant date | Dec 3, 1996 |
| Priority date | — |
| Expiry date | Apr 5, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2998
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Compositions and methods for treating a contact lens are disclosed. In one embodiment, the composition comprises an ophthalmically acceptable liquid aqueous medium and a plurality of particles which possess a hardness gradient. The hardness gradient of the particles is due to the particles having a relatively inelastic, water-impermeable core and a soft, water-permeable outer layer surrounding the core. The particles afford both high specific pressure on a contact lens surface and textural softness, which diminishes surface abrasion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.