GB996621A - A combined subjective and objective refracting device - Google Patents

A combined subjective and objective refracting device

Info

Publication number
GB996621A
GB996621A GB3016261A GB3016261A GB996621A GB 996621 A GB996621 A GB 996621A GB 3016261 A GB3016261 A GB 3016261A GB 3016261 A GB3016261 A GB 3016261A GB 996621 A GB996621 A GB 996621A
Authority
GB
United Kingdom
Prior art keywords
source
lens
reflector
semi
additional lens
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
GB3016261A
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.)
HARRY MAURICE FELIX ASHER
Original Assignee
HARRY MAURICE FELIX ASHER
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 HARRY MAURICE FELIX ASHER filed Critical HARRY MAURICE FELIX ASHER
Priority to GB3016261A priority Critical patent/GB996621A/en
Publication of GB996621A publication Critical patent/GB996621A/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
    • A61B3/02—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
    • 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
    • A61B3/12—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for looking at the eye fundus, e.g. ophthalmoscopes

Abstract

996,621. Sight-testing apparatus. H. M. F. ASHER. Aug. 22, 1962 [Aug. 22,1961], No. 30162/61. Heading G2J. The apparatus described and claimed in Specification 830,141 is modified by the omission of the transparency so that an image of light source 5 can be focused on the patient's eye and the latter received through semi-reflector 3. Between semi-reflector 3 and the observed may be an additional lens having the same focal length as lens 2 and disposed of the same distance from semi-reflector 3 so that an aerial image of the patient's eye is formed at a distance from mirror 3 equal to that of the source 5. This aerial image may itself be received through a magnifying eyepiece; which is coupled for movement with source 5 to maintain the symmetry of the arrangement. The eyepiece and the additional lens may be arranged so that either or both may be swung in a and or position. Source 5, lens 2 or the additional lens may also have a transverse movement in any meridian or be given a circular movement in this own plane. The instrument may be used to carry out three different methods of operation as explained in the Specification.
GB3016261A 1961-08-22 1961-08-22 A combined subjective and objective refracting device Expired GB996621A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3016261A GB996621A (en) 1961-08-22 1961-08-22 A combined subjective and objective refracting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3016261A GB996621A (en) 1961-08-22 1961-08-22 A combined subjective and objective refracting device

Publications (1)

Publication Number Publication Date
GB996621A true GB996621A (en) 1965-06-30

Family

ID=10303276

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3016261A Expired GB996621A (en) 1961-08-22 1961-08-22 A combined subjective and objective refracting device

Country Status (1)

Country Link
GB (1) GB996621A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3405994A (en) * 1964-09-14 1968-10-15 Bausch & Lomb Variable incidence type slit lamp mechanism
CN115113389A (en) * 2022-06-08 2022-09-27 温州医科大学 Synchronous real-time analysis system for stability of tear film and light path construction method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3405994A (en) * 1964-09-14 1968-10-15 Bausch & Lomb Variable incidence type slit lamp mechanism
CN115113389A (en) * 2022-06-08 2022-09-27 温州医科大学 Synchronous real-time analysis system for stability of tear film and light path construction method
CN115113389B (en) * 2022-06-08 2023-08-18 温州医科大学 Tear film stability synchronous real-time analysis system and optical path construction method

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