Auxiliary lens attachment for an optical device
US5835289A · kind A · utility
15Cited by
11References
6Claims
0Family size
Inventor
Key dates
| Filing date | Jan 7, 1997 |
| Grant date | Nov 10, 1998 |
| Priority date | — |
| Expiry date | Jan 7, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An auxiliary lens attachment (22) for an optical device (10) is removably positioned between an eyepiece (12) and an objective lens (19). The auxiliary attachment (22) includes a cylindrical prescription lens (30) which corrects an astigmatism in the eye of the user. The auxiliary lens attachment (22) is rotated with the eyepiece (12) relative to the objective lens (19) for positioning the auxiliary attachment (22) at a precise rotational position relative to objection lens (19) for correction of the astigmatism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.