Objective phoropter
US10383513B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 2016 |
| Grant date | Aug 20, 2019 |
| Priority date | — |
| Expiry date | Aug 5, 2036 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2560/0238
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An objective phoropter utilizing an illuminated keratometric object projecting its illumination onto the subject's cornea, and imaging the reflection therefrom in an imaging camera. Image processing of these images is used to improve the focusing and centering of the cornea subject's eyes. Once the correctly focused position of the eyes is obtained relative to the keratometer object, an accurate longitudinal position of the eyes relative to the lens wheel assemblies can also be achieved. This results in more accurate prescription generation than in prior art systems where the eyes may not be accurately positioned relative to the lens wheels. Additionally, the lens combinations of the entire phoropter wheel can be calibrated using an artificial eye having adjustable levels of aberration. Each lens combination is adjusted to supposedly correct a selected aberration level, and any residual aberration measured represents the correction to be applied to that lens combination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.