Means and methods of measuring refraction
US12268447B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2021 |
| Grant date | Apr 8, 2025 |
| Priority date | — |
| Expiry date | Nov 8, 2043 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/135
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In an embodiment, multiple conjugate planes are used to create a plurality of optical pupil planes and a plurality of image planes. These optical planes solve multiple problems and introduce significant performance enhancements in the system. In one implementation of a disclosed embodiment, the measurement channel is based on the reverse Shack-Hartmann principle. By introducing a relay system (for example a 4-f lens system) the slit plane could be made conjugate to the measured system pupil plane (unlike a previous implementation where the slits were places away from the pupil plane as it was not accessible directly). Creating a virtual pupil plane allows for more accurate placement of the plane without the need for contact with the measured optical system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.