Portable, public use reading glasses eye tester
US5486879A · kind A · utility
Inventor
Key dates
| Filing date | Jun 6, 1994 |
| Grant date | Jan 23, 1996 |
| Priority date | — |
| Expiry date | Jun 6, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/032
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Two identical plates somewhat in the shape of very large eyeglass frames sandwiching two rotable discs, one for each eye, form the front section of the device. Each disc has a series of magnifying lenses of increasing power which can be brought into the eye openings in the plate when the discs are rotated and allow the user to focus on a group of alphbetical characters of a predetermined size and at a predetermined distance from the lenses at the end of a view tunnel. The strength of the lenses required for focusing can then be read from the disc where it is clearly indicated next to each lens. These lens strengths correspond to the power of reading glasses sold non-prescription in most drug stores.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.