ES2043539A2 - Optometer - Google Patents
OptometerInfo
- Publication number
- ES2043539A2 ES2043539A2 ES9200739A ES9200739A ES2043539A2 ES 2043539 A2 ES2043539 A2 ES 2043539A2 ES 9200739 A ES9200739 A ES 9200739A ES 9200739 A ES9200739 A ES 9200739A ES 2043539 A2 ES2043539 A2 ES 2043539A2
- Authority
- ES
- Spain
- Prior art keywords
- image
- retina
- infrared
- electronic module
- test
- 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.)
- Granted
Links
Landscapes
- Eye Examination Apparatus (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Optometer which, comprising three optical parts corresponding to a projection system, an optotype test system and an analysing system, and an electronic module, analyses the image of an aperture projected in infrared onto the retina by means of an electronic sweep of the back of the latter, additionally superposing a visor to test the accommodation status, the electronic module sweeping the retinal image formed. As a function of the ametropia of the eye in question, the image on the retina of the narrow aperture projected in infrared will be a more or less narrow band which will be detected easily by focusing its image in a linear multiple photodiode sensor which in turn sends its electrical output to a signal- processing stage in order, once cleaned up, to subject it to a frequency transposition (translation) so that the frequency obtained is within the audible spectrum.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES9200739A ES2043539B1 (en) | 1992-04-07 | 1992-04-07 | OPTOMETER. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES9200739A ES2043539B1 (en) | 1992-04-07 | 1992-04-07 | OPTOMETER. |
Publications (3)
Publication Number | Publication Date |
---|---|
ES2043539A2 true ES2043539A2 (en) | 1993-12-16 |
ES2043539R ES2043539R (en) | 1996-06-16 |
ES2043539B1 ES2043539B1 (en) | 1997-02-16 |
Family
ID=8276646
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES9200739A Expired - Lifetime ES2043539B1 (en) | 1992-04-07 | 1992-04-07 | OPTOMETER. |
Country Status (1)
Country | Link |
---|---|
ES (1) | ES2043539B1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4162828A (en) * | 1977-09-30 | 1979-07-31 | Trachtman Joseph N | Apparatus and methods for directly measuring the refraction of the eye |
GB2078395A (en) * | 1980-06-26 | 1982-01-06 | Pilkington Perkin Elmer Ltd | Optical apparatus for ascertaining eye accommodation state |
GB2134281A (en) * | 1983-01-25 | 1984-08-08 | Joseph Norman Trachtman | Visual accommodation training |
-
1992
- 1992-04-07 ES ES9200739A patent/ES2043539B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4162828A (en) * | 1977-09-30 | 1979-07-31 | Trachtman Joseph N | Apparatus and methods for directly measuring the refraction of the eye |
GB2078395A (en) * | 1980-06-26 | 1982-01-06 | Pilkington Perkin Elmer Ltd | Optical apparatus for ascertaining eye accommodation state |
GB2134281A (en) * | 1983-01-25 | 1984-08-08 | Joseph Norman Trachtman | Visual accommodation training |
Also Published As
Publication number | Publication date |
---|---|
ES2043539R (en) | 1996-06-16 |
ES2043539B1 (en) | 1997-02-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EC2A | Search report published |
Date of ref document: 19920407 Kind code of ref document: B1 Effective date: 19920407 |
|
FA2A | Application withdrawn |
Effective date: 19980401 |