Smart phone based virtual visual charts for measuring visual acuity
US11432718B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2018 |
| Grant date | Sep 6, 2022 |
| Priority date | — |
| Expiry date | Mar 27, 2039 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/18
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A system for replicating a standardized visual acuity test, such as the 20′ Snellen test may comprise a binocular viewer attached to a smartphone. A binocular viewer may comprise a housing comprising a pair tube covers having voids allowing for viewing through a pair of lens tubes with each lens tube in visual communication with a second lens a first lens an aperture and a front cover. The optical systems use an artful combination of front and back lens surfaces, demagnification and other systems to faithfully replicate the sight lines perceived by a user of a traditional 20′ test. The system also allows for the incorporation of other tests conducted with both eyes including Color Sensitivity and Contrast, furthermore by placing a deformable, tunable lens between the second lens and the eye the device serves as an ophthalmic refractometer, allowing a Spherical Equivalent refraction estimate for each eye.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.