| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 3 | |
| #2 | Germany | 3 | |
| #3 | United Kingdom | 3 | |
| #4 | United States | 3 | |
| #5 | Australia | 2 | |
| #6 | Canada | 2 | |
| #7 | Hong Kong | 2 | |
| #8 | Japan | 2 | |
| #9 | Belgium | 1 | |
| #10 | Brazil | 1 | |
| #11 | EPO (European Patent Office) | 1 | |
| #12 | Italy | 1 | |
| #13 | Netherlands | 1 |
| # | Industry | |
|---|---|---|
| #1 | Medical technology | |
| #2 | Measurement | |
| #3 | Optics |
| # | Technology | |
|---|---|---|
| #1 | Diagnosis and surgery | |
| #2 | Testing of structures | |
| #3 | Optical systems |
| # | Name | Total Patents |
|---|---|---|
| #1 | Guyton David Lee | 10 |
| #2 | Guyton David L | 9 |
| #3 | Waltuck Morey Herbert | 3 |
| #4 | Waltuck Herbert | 1 |
| #5 | Sandruck Julie Christine | 1 |
| #6 | Hunter David George | 1 |
| #7 | Guyton D L | 1 |
| #8 | Fry Robert Lee | 1 |
| #9 | Patel Saurabh Navinchandra | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4552440A | Apparatus for determination of potential visual acuity utilizing a slit lamp microscope | |
| US4435052A | Ophthalmic test apparatus having magnification compensation | |
| US4105303A | Method for determining the refractive correction for an eye | |
| CA1015188A | Zonal focus method for determining ophthalmic and other astigmatic correction | |
| GB1461118A | Zonal focus method for determining the amount of a stigmatic correction for an optical system |