System and method for measurement of refractive error of an eye based on subjective distance metering
US10702143B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 30, 2016 |
| Grant date | Jul 7, 2020 |
| Priority date | — |
| Expiry date | Aug 26, 2037 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/036
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The method include: (a) displaying at least one dynamic target image of at least one sign over a display area; (b) receiving subjective feedback from the subject indicating that the subject is positioned at a maximum distance of best acuity (MDBA) from the target image, wherein the MDBA is the maximum distance in which the subject recognizes the sign; (c) measuring one or more parameter associated with distance, during the time the subject has reached the MDBA distance, using at least one sensor; (d) estimating the MDBA by estimating the distance between the eye of the subject and the display area in which the target image is displayed by using the sensor data and (e) calculating the refractive error of the eye according to the estimated MDBA and characteristics of the target image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.