Presbyometer including lockstep means
US5729324A · kind A · utility
Inventor
Key dates
| Filing date | Sep 28, 1995 |
| Grant date | Mar 17, 1998 |
| Priority date | — |
| Expiry date | Sep 28, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/0285
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A presbyometer for aid in selecting the appropriate strength of over-the-counter (OTC) reading glasses is disclosed. The device comprises a view assembly with a pair of rotational lens wheels. The lens wheels each have a plurality of spaced apart apertures, each having a lens of differing dioptric strength. A user looks through the first lens on each lens wheel toward a back plate having a visual target. The lens wheels are rotated, thereby bringing a lens of increasing Diopter strength into exposure. When the user can adequately read the stimulus, the correct level of Diopter strength correction is identified and corresponding OTC glasses are purchased. A ocular width adjustment means is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.