Refraction system for facilitating contact lens fitting
US8915594B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 2012 |
| Grant date | Dec 23, 2014 |
| Priority date | — |
| Expiry date | Jun 22, 2033 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/1015
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention contemplates a refraction system facilitating for contact lens fitting via measuring the patient's refraction on the corneal plane and via introducing a conjugated plane of the corneal plane for insertion of a contact lens simulator or phase plate. The present invention also contemplates a refraction system to integrate the objective and subjective measurement into a single instrument. The present invention further contemplates a refraction system with open-field and binocular viewing to overcome instrument myopia and to measure accommodation. The present invention also further contemplates a refraction system employing a pair of optical trombones to eliminate the need of flipping plurality sets of trial lenses for defocus corrections. The present invention even further contemplates a multiple vergence acuity chart to facilitate patient's judgment of best corrected visual acuity. The present invention is thus aimed to provide a refraction system that overcomes the identified issues with the commonly used auto-refractor and phoropter and that enables effective use of contact lens simulators or phase plates to facilitate fitting of multifocal contact lenses for …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.