GB634546A - Improvements in or relating to ophthalmoscopes and other instruments for examining the human eye - Google Patents
Improvements in or relating to ophthalmoscopes and other instruments for examining the human eyeInfo
- Publication number
- GB634546A GB634546A GB283148A GB283148A GB634546A GB 634546 A GB634546 A GB 634546A GB 283148 A GB283148 A GB 283148A GB 283148 A GB283148 A GB 283148A GB 634546 A GB634546 A GB 634546A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens
- casing
- track
- cells
- lenses
- 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
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
- A61B3/12—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
- A61B3/1208—Multiple lens hand-held instruments
Abstract
634,546. Sight-testing apparatus. ALLIED INSTRUMENT MANUFACTURERS, Ltd., and STOCKWELL, H. J. Jan. 30, 1948, No. 2831. [Class 97 (i)] In an uphthalmoscope or other eyeobserving instrument in which a number of lenses of different focal length are movable in an endless track to be selectively located at an observation point, each lens is contained in a cell having a portion of larger diameter and a portion of smaller diameter, the latter portion engaging retaining means in the casing, and the casing being so shaped that the larger portions of some at least of the cells protrude therefrom to permit direct driving of the cells by hand around the track. As shown in Fig. 4, the lens C is held in a cell portion B<SP>1</SP> of larger diameter by a smaller diameter portion B<SP>2</SP> which is extended to engage in a groove A<SP>3</SP>, Fig. 2, in an endless track A<SP>2</SP> in the casing A. The casing is cut away at E, E<SP>1</SP> to permit manual access to the larger portions B<SP>1</SP> of some of the cells B. An observation opening, not shown, is located in the casing at the top of the track and the lens in use is held in that position by a spring-pressed pivoted catch F. To allow of use of a greater range of lens powers a plate G, bearing supplementary lenses, is pivoted to the casing to bring such lenses selectively adjacent the track lens at the viewing aperture. The instrument also carries a lamp, condenser lens and a reflector adjacent the viewing aperture to reflect light into the patient's eye. In an alternative, the track groove A<SP>3</SP> may engage a central reduced portion of the lens cell which has outer portions of larger diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB283148A GB634546A (en) | 1948-01-30 | 1948-01-30 | Improvements in or relating to ophthalmoscopes and other instruments for examining the human eye |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB283148A GB634546A (en) | 1948-01-30 | 1948-01-30 | Improvements in or relating to ophthalmoscopes and other instruments for examining the human eye |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB634546A true GB634546A (en) | 1950-03-22 |
Family
ID=9746760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB283148A Expired GB634546A (en) | 1948-01-30 | 1948-01-30 | Improvements in or relating to ophthalmoscopes and other instruments for examining the human eye |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB634546A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116594143A (en) * | 2023-07-18 | 2023-08-15 | 南京佰福激光技术有限公司 | Laser spot size adjusting device and adjusting method thereof |
-
1948
- 1948-01-30 GB GB283148A patent/GB634546A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116594143A (en) * | 2023-07-18 | 2023-08-15 | 南京佰福激光技术有限公司 | Laser spot size adjusting device and adjusting method thereof |
| CN116594143B (en) * | 2023-07-18 | 2023-10-27 | 南京佰福激光技术有限公司 | Laser spot size adjusting device and adjusting method thereof |
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