Portable vision testing apparatus
US10426334B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2016 |
| Grant date | Oct 1, 2019 |
| Priority date | — |
| Expiry date | May 21, 2036 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/028
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A vision testing apparatus is disclosed. The apparatus has a frame comprising a face plate with at least one eye shield having a viewing slot positioned in a viewing direction perpendicular to the face plate, at least one variable lens element including an outer rail and multiple regions of varying diopter power having a width that is equal to or greater than the width of the viewing slot of the eye shield, and adjustable controls for moving the variable lens element in a direction perpendicularly to the viewing direction along a plane of the face plate. The testing apparatus is portable and can be used in developing nations where visual acuity is not corrected because of lack of access to optometric care.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.