GB511555A - An improvement in ophthalmoscopes and ophthalmic refractometers - Google Patents

An improvement in ophthalmoscopes and ophthalmic refractometers

Info

Publication number
GB511555A
GB511555A GB1089938A GB1089938A GB511555A GB 511555 A GB511555 A GB 511555A GB 1089938 A GB1089938 A GB 1089938A GB 1089938 A GB1089938 A GB 1089938A GB 511555 A GB511555 A GB 511555A
Authority
GB
United Kingdom
Prior art keywords
lens
retina
diaphragm
plane
reflected
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
GB1089938A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB1089938A priority Critical patent/GB511555A/en
Publication of GB511555A publication Critical patent/GB511555A/en
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

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)

Abstract

511,555. Ophthalmoscopes. HOLLOWAY, S. P. April 9, 1938, No. 10899. [Class 97 (i)] In an ophthalmoscope having a light source, the luminous beam, after passing through a multiple-apertured diaphragm is sectionally deflected by prisms and focused by a lens or lenses so that images are formed and brought edge to edge on the retina of an observed eye. The diaphragm d, illuminated by the source l and condensers c, c<1>, c<2>, is divided by a strip a into two apertures which are imaged by the lens e in the plane i, a double prism p being interposed so as to bring the straight edges of the images of the apertures close together. The projection lens f normally has its principal focus in the plane i, so that the emergent light pencils are parallel. These are reflected by the mirror n into the observed eye o, giving an image on the retina k. The lens f is adjustable by means of a drum g for focusing this image on the retina of an ametropic eye. The two reflected beams have a dark space d' between them, all the rays being parallel to, or diverging from the axis of the system, so that any rays reflected from the cornea are directed outwards. In a modification, the prism p is arranged adjacent the diaphragm d in the focal plane of the lens f, the lens e being omitted.
GB1089938A 1938-04-09 1938-04-09 An improvement in ophthalmoscopes and ophthalmic refractometers Expired GB511555A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1089938A GB511555A (en) 1938-04-09 1938-04-09 An improvement in ophthalmoscopes and ophthalmic refractometers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1089938A GB511555A (en) 1938-04-09 1938-04-09 An improvement in ophthalmoscopes and ophthalmic refractometers

Publications (1)

Publication Number Publication Date
GB511555A true GB511555A (en) 1939-08-21

Family

ID=9976356

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1089938A Expired GB511555A (en) 1938-04-09 1938-04-09 An improvement in ophthalmoscopes and ophthalmic refractometers

Country Status (1)

Country Link
GB (1) GB511555A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2902899A (en) * 1954-08-31 1959-09-08 Oculus Optikgerate G M B H Ophthalmological hand instrument for the examination of the retina of the eye
GB2149139A (en) * 1983-10-28 1985-06-05 Zeiss Stiftung Light trap for eye examination instruments
GB2407395B (en) * 2003-10-21 2008-03-05 Ophthalmos Ltd Ophthalmoscope
GB2505546A (en) * 2012-09-03 2014-03-05 Zumax Medical Co Ltd Retinoscope with condensing lens column

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2902899A (en) * 1954-08-31 1959-09-08 Oculus Optikgerate G M B H Ophthalmological hand instrument for the examination of the retina of the eye
GB2149139A (en) * 1983-10-28 1985-06-05 Zeiss Stiftung Light trap for eye examination instruments
GB2407395B (en) * 2003-10-21 2008-03-05 Ophthalmos Ltd Ophthalmoscope
GB2505546A (en) * 2012-09-03 2014-03-05 Zumax Medical Co Ltd Retinoscope with condensing lens column

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