Apparatus for determining ametropia of an eye
US10398308B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 2016 |
| Grant date | Sep 3, 2019 |
| Priority date | — |
| Expiry date | Jul 3, 2037 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/1015
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An apparatus for determining ametropia of an eye includes an optical assembly with a light source, a detector, a plurality of optical elements and at least one stray light stop and a controller. An illumination beam path is provided between the light source and an optical interface in order to allow illumination light generated by the light source to emerge from the optical interface. A measurement beam path is provided between the optical interface and the detector in order to supply measurement light entering through the optical interface to the detector. The measurement beam path passes through an aperture of the at least one stray light stop. A diameter of this aperture is variable or a position of this aperture along the measurement beam path is variable in order to reduce stray light at the detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.