JPS5525281Y2 - - Google Patents
Info
- Publication number
- JPS5525281Y2 JPS5525281Y2 JP1976011220U JP1122076U JPS5525281Y2 JP S5525281 Y2 JPS5525281 Y2 JP S5525281Y2 JP 1976011220 U JP1976011220 U JP 1976011220U JP 1122076 U JP1122076 U JP 1122076U JP S5525281 Y2 JPS5525281 Y2 JP S5525281Y2
- Authority
- JP
- Japan
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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)
- Biophysics (AREA)
- Ophthalmology & Optometry (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Eye Examination Apparatus (AREA)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1976011220U JPS5525281Y2 (forum.php) | 1976-02-03 | 1976-02-03 | |
| US05/762,338 US4094592A (en) | 1976-02-03 | 1977-01-25 | Ophthalmic examination chart projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1976011220U JPS5525281Y2 (forum.php) | 1976-02-03 | 1976-02-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS52105897U JPS52105897U (forum.php) | 1977-08-11 |
| JPS5525281Y2 true JPS5525281Y2 (forum.php) | 1980-06-18 |
Family
ID=11771874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1976011220U Expired JPS5525281Y2 (forum.php) | 1976-02-03 | 1976-02-03 |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4094592A (forum.php) |
| JP (1) | JPS5525281Y2 (forum.php) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050018138A1 (en) * | 2003-07-23 | 2005-01-27 | Robert Grainger | Advanced astigmatism testing method |
| CN109567736A (zh) * | 2017-09-28 | 2019-04-05 | 依视路国际公司 | 视力测量装置以及使用其来测量视力的方法 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2570652A (en) * | 1949-05-04 | 1951-10-09 | James J Dilks | Picture disk viewing projector |
| US3143037A (en) * | 1962-02-23 | 1964-08-04 | Eastman Kodak Co | Slide projector interlock system for the slide-changing and editing mechanisms |
| JPS4222361Y1 (forum.php) * | 1965-02-01 | 1967-12-20 | ||
| FR2066108A5 (forum.php) * | 1969-10-31 | 1971-08-06 | Agfa Gevaert Ag | |
| US3655276A (en) * | 1969-10-31 | 1972-04-11 | American Optical Corp | Ophthalmic refracting chart projector |
| JPS471586U (forum.php) * | 1971-01-13 | 1972-08-17 | ||
| JPS4926290U (forum.php) * | 1972-06-08 | 1974-03-06 |
-
1976
- 1976-02-03 JP JP1976011220U patent/JPS5525281Y2/ja not_active Expired
-
1977
- 1977-01-25 US US05/762,338 patent/US4094592A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS52105897U (forum.php) | 1977-08-11 |
| US4094592A (en) | 1978-06-13 |