DE2417079C2 - Refraktometer zur automatischen Messung der Brechkraft des Auges - Google Patents

Refraktometer zur automatischen Messung der Brechkraft des Auges

Info

Publication number
DE2417079C2
DE2417079C2 DE2417079A DE2417079A DE2417079C2 DE 2417079 C2 DE2417079 C2 DE 2417079C2 DE 2417079 A DE2417079 A DE 2417079A DE 2417079 A DE2417079 A DE 2417079A DE 2417079 C2 DE2417079 C2 DE 2417079C2
Authority
DE
Germany
Prior art keywords
eye
refractometer
analog signal
blinking
signal
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
Application number
DE2417079A
Other languages
German (de)
English (en)
Other versions
DE2417079A1 (de
Inventor
Terrance N. Fairport N.Y. Clapham
James W. Rochester N.Y. Horwitz
Charles R. Fairport N.Y. Munnerlyn
Bruce R. Penfield N.Y. Robinson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tropel Inc
Original Assignee
Tropel Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tropel Inc filed Critical Tropel Inc
Publication of DE2417079A1 publication Critical patent/DE2417079A1/de
Application granted granted Critical
Publication of DE2417079C2 publication Critical patent/DE2417079C2/de
Expired legal-status Critical Current

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
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/103—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for determining refraction, e.g. refractometers, skiascopes
    • 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
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Measuring devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb
    • A61B5/1103—Detecting muscular movement of the eye, e.g. eyelid movement
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7235—Details of waveform analysis
    • A61B5/7239—Details of waveform analysis using differentiation including higher order derivatives

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Biophysics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Physics & Mathematics (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Physiology (AREA)
  • Dentistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Pathology (AREA)
  • Eye Examination Apparatus (AREA)
DE2417079A 1973-04-23 1974-04-08 Refraktometer zur automatischen Messung der Brechkraft des Auges Expired DE2417079C2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00353649A US3802768A (en) 1973-04-23 1973-04-23 Blink compensating method for objective refractor for the eye

Publications (2)

Publication Number Publication Date
DE2417079A1 DE2417079A1 (de) 1974-11-21
DE2417079C2 true DE2417079C2 (de) 1984-09-20

Family

ID=23389990

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2417079A Expired DE2417079C2 (de) 1973-04-23 1974-04-08 Refraktometer zur automatischen Messung der Brechkraft des Auges

Country Status (5)

Country Link
US (1) US3802768A (enExample)
JP (1) JPS5211694A (enExample)
DE (1) DE2417079C2 (enExample)
FR (1) FR2226142B1 (enExample)
GB (1) GB1438730A (enExample)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5542624A (en) * 1978-09-20 1980-03-26 Canon Kk Automatic eye refraction measuring system
JPS55125843A (en) * 1979-03-20 1980-09-29 Canon Kk Optic refractometer
JPS56156136A (en) * 1980-05-02 1981-12-02 Asahi Optical Co Ltd Apparatus for detecting eye blink during detection
DE3833208C2 (de) * 1988-09-30 1997-03-13 Bron Elektronik Ag Verfahren zur Messung der Blitzdauer eines Blitzgerätes sowie Einrichtung zur Durchführung eines solchen Verfahrens
US6337993B1 (en) * 1997-02-27 2002-01-08 Canon Kabushiki Kaisha Blood flow measuring apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2996624A (en) * 1959-08-11 1961-08-15 Victor R Mumma Method for stretching photometer pulses for accurate measurement of pulse height
US3524702A (en) * 1968-09-06 1970-08-18 John G Bellows Apparatus for objectively and automatically refracting the eye

Also Published As

Publication number Publication date
FR2226142B1 (enExample) 1977-10-14
GB1438730A (en) 1976-06-09
JPS539478B2 (enExample) 1978-04-06
DE2417079A1 (de) 1974-11-21
US3802768A (en) 1974-04-09
FR2226142A1 (enExample) 1974-11-15
JPS5211694A (en) 1977-01-28

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Legal Events

Date Code Title Description
8128 New person/name/address of the agent

Representative=s name: SPOTT, G., DIPL.-CHEM. DR.RER.NAT., PAT.-ANW., 800

D2 Grant after examination
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee