DD124767A1 - - Google Patents
Info
- Publication number
- DD124767A1 DD124767A1 DD189087A DD18908775A DD124767A1 DD 124767 A1 DD124767 A1 DD 124767A1 DD 189087 A DD189087 A DD 189087A DD 18908775 A DD18908775 A DD 18908775A DD 124767 A1 DD124767 A1 DD 124767A1
- Authority
- DD
- German Democratic Republic
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/02—Subjective types, i.e. testing apparatus requiring the active assistance of the patient
- A61B3/028—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for testing visual acuity; for determination of refraction, e.g. phoropters
- A61B3/032—Devices for presenting test symbols or characters, e.g. test chart projectors
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Animal Behavior & Ethology (AREA)
- Ophthalmology & Optometry (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Biophysics (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Eye Examination Apparatus (AREA)
- Projection Apparatus (AREA)
- Apparatus For Radiation Diagnosis (AREA)
- Investigating Or Analysing Biological Materials (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19742451750 DE2451750C3 (de) | 1974-10-31 | Testscheibe für Augenuntersuchungsgeräte |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DD124767A1 true DD124767A1 (ja) | 1977-03-16 |
Family
ID=5929702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DD189087A DD124767A1 (ja) | 1974-10-31 | 1975-10-28 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4053212A (ja) |
| JP (1) | JPS5421680B2 (ja) |
| DD (1) | DD124767A1 (ja) |
| ES (1) | ES441172A1 (ja) |
| FR (1) | FR2289148A1 (ja) |
| IT (1) | IT1048068B (ja) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7390091B2 (en) * | 2005-04-29 | 2008-06-24 | Sperian Protection Optical, Inc. | Vision testing apparatus |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1698013A (en) * | 1924-09-13 | 1929-01-08 | Zeng Standard Company De | Projection device |
| US2357593A (en) * | 1941-09-24 | 1944-09-05 | Ullin W Leavell | Method and apparatus for teaching reading |
| US3486813A (en) * | 1967-05-05 | 1969-12-30 | Tracor | Vision testing device |
| US3807839A (en) * | 1972-01-28 | 1974-04-30 | Calspan Corp | Dynamic visual acuity testing apparatus |
| US3910690A (en) * | 1972-02-02 | 1975-10-07 | Wilkinson Sword Ltd | Method and apparatus for determining visual acuity in a human subject |
| JPS5338779Y2 (ja) * | 1975-07-31 | 1978-09-20 |
-
1975
- 1975-09-22 ES ES441172A patent/ES441172A1/es not_active Expired
- 1975-10-01 JP JP11871175A patent/JPS5421680B2/ja not_active Expired
- 1975-10-07 FR FR7530614A patent/FR2289148A1/fr active Granted
- 1975-10-17 US US05/623,473 patent/US4053212A/en not_active Expired - Lifetime
- 1975-10-20 IT IT51853/75A patent/IT1048068B/it active
- 1975-10-28 DD DD189087A patent/DD124767A1/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE2451750B2 (de) | 1976-11-11 |
| IT1048068B (it) | 1980-11-20 |
| FR2289148B1 (ja) | 1981-08-21 |
| US4053212A (en) | 1977-10-11 |
| ES441172A1 (es) | 1977-03-16 |
| DE2451750A1 (de) | 1976-05-06 |
| JPS5421680B2 (ja) | 1979-08-01 |
| FR2289148A1 (fr) | 1976-05-28 |
| JPS5167691A (ja) | 1976-06-11 |