DE2541875C2 - - Google Patents
Info
- Publication number
- DE2541875C2 DE2541875C2 DE19752541875 DE2541875A DE2541875C2 DE 2541875 C2 DE2541875 C2 DE 2541875C2 DE 19752541875 DE19752541875 DE 19752541875 DE 2541875 A DE2541875 A DE 2541875A DE 2541875 C2 DE2541875 C2 DE 2541875C2
- Authority
- DE
- Germany
- Prior art keywords
- astigmatic
- assembly
- test pattern
- line
- cylinder
- Prior art date
- 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
- 238000012360 testing method Methods 0.000 claims description 107
- 230000003287 optical effect Effects 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 28
- 230000004304 visual acuity Effects 0.000 claims description 19
- 230000000712 assembly Effects 0.000 claims description 6
- 238000000429 assembly Methods 0.000 claims description 6
- 208000014733 refractive error Diseases 0.000 claims 1
- 201000009310 astigmatism Diseases 0.000 description 61
- 238000012937 correction Methods 0.000 description 50
- 230000002207 retinal effect Effects 0.000 description 17
- 230000000007 visual effect Effects 0.000 description 17
- 230000008859 change Effects 0.000 description 16
- 230000008901 benefit Effects 0.000 description 12
- 238000005259 measurement Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 11
- 230000004438 eyesight Effects 0.000 description 11
- 230000004075 alteration Effects 0.000 description 10
- 230000008569 process Effects 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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
- A61B3/036—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for testing visual acuity; for determination of refraction, e.g. phoropters for testing astigmatism
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 (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19752541875 DE2541875A1 (de) | 1975-09-19 | 1975-09-19 | Verfahren und vorrichtung zur sehkraftbestimmung |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19752541875 DE2541875A1 (de) | 1975-09-19 | 1975-09-19 | Verfahren und vorrichtung zur sehkraftbestimmung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE2541875A1 DE2541875A1 (de) | 1977-03-24 |
| DE2541875C2 true DE2541875C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1988-01-07 |
Family
ID=5956933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19752541875 Granted DE2541875A1 (de) | 1975-09-19 | 1975-09-19 | Verfahren und vorrichtung zur sehkraftbestimmung |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE2541875A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2713330A1 (de) * | 1976-03-26 | 1977-10-06 | Humphrey Instruments Inc | Verfahren und vorrichtung zur sehkraftbestimmung |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE719075C (de) * | 1938-07-05 | 1942-03-28 | Zeiss Carl Fa | Vorrichtung zum subjektiven Bestimmen der Lage der Hauptschnitte eines astigmatischen Auges |
| US3305294A (en) * | 1964-12-03 | 1967-02-21 | Optical Res & Dev Corp | Two-element variable-power spherical lens |
| US3507565A (en) * | 1967-02-21 | 1970-04-21 | Optical Res & Dev Corp | Variable-power lens and system |
| US3751138A (en) * | 1972-03-16 | 1973-08-07 | Humphrey Res Ass | Variable anamorphic lens and method for constructing lens |
| US3822932A (en) * | 1972-06-15 | 1974-07-09 | Humphrey Res Ass | Optometric apparatus and process having independent astigmatic and spherical inputs |
| US3785723A (en) * | 1973-02-27 | 1974-01-15 | D Guyton | Method and apparatus for locating a principal meridian of an astigmatic optical system |
| US3874932A (en) * | 1973-06-15 | 1975-04-01 | Hitachi Maxell | Dry cells |
-
1975
- 1975-09-19 DE DE19752541875 patent/DE2541875A1/de active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE2541875A1 (de) | 1977-03-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8110 | Request for examination paragraph 44 | ||
| 8127 | New person/name/address of the applicant |
Owner name: ALLERGAN HUMPHREY, SAN LEANDRO, CALIF., US |
|
| AG | Has addition no. |
Ref country code: DE Ref document number: 2713330 Format of ref document f/p: P |
|
| D2 | Grant after examination | ||
| 8364 | No opposition during term of opposition | ||
| AG | Has addition no. |
Ref country code: DE Ref document number: 2713330 Format of ref document f/p: P |
|
| 8339 | Ceased/non-payment of the annual fee |