Pupil measuring apparatus
US7407287B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 10, 2006 |
| Grant date | Aug 5, 2008 |
| Priority date | — |
| Expiry date | Apr 10, 2026 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/11
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A pupil measuring apparatus comprises a mark 1d placed in a space where a background is observable from the two eyes E; a mark moving device 1e for moving the mark 1d between the two eyes E and the background; an illumination optical system 1g for illuminating the two eyes E from the background side; two cameras A, B for respectively imaging the two pupils PP; calculating means 2a to 2e for calculating areas or diameters of the respective pupils thus imaged, from video signals of the two cameras A, B; and a display 3 for providing an output of a graph of change in the areas or diameters calculated against a position of the mark 1d or a time associated with the position on a single screen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.