Chart projector for testing visual acuity
US12220168B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 2021 |
| Grant date | Feb 11, 2025 |
| Priority date | — |
| Expiry date | Sep 27, 2043 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/08
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A chart projector for testing visual acuity capable of detecting a brightness of a visual acuity chart which is projected to an examined eye includes at least one image display device which produces visual acuity chart image; a beam splitter; and a photo sensor which detects a brightness of the chart image reflected from the beam splitter to determine a brightness of visual acuity chart image which passes the beam splitter and projected to the examined eye or which detects a brightness of the chart image which passes the beam splitter to determine a brightness of visual acuity chart image reflected from the beam splitter and projected to the examined eye.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.