GB854210A - Improvements in or relating to apparatus for use in sight testing - Google Patents
Improvements in or relating to apparatus for use in sight testingInfo
- Publication number
- GB854210A GB854210A GB3014457A GB3014457A GB854210A GB 854210 A GB854210 A GB 854210A GB 3014457 A GB3014457 A GB 3014457A GB 3014457 A GB3014457 A GB 3014457A GB 854210 A GB854210 A GB 854210A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mirrors
- silvered
- eye
- sept
- objects
- 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
- A61B3/02—Subjective types, i.e. testing apparatus requiring the active assistance of the patient
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
854,210. Sight testing apparatus. TURVILLE, A. E. Sept. 10, 1958 [Sept. 25, 1957; Feb. 27, 1958], Nos. 30144/57'and 6458/58. Class 97(1) Apparatus, for use in sight testing, comprises two mirrors, inclined at a large obtuse angle, and a pair of complementary stereoscopic representations so arranged that an observer of normal vision is able to see both mirrors with each eye but only the reflection of one representation in one mirror with each eye so that the two reflections appear to coalesce into a stereoscopic image. The apparatus shown in Fig. 4 comprises a frame 44 to which is attached a mirror system 46, tiltable about a universal pivot 47, a handle 41, a test chart 50 with "objects" 103 and 101, and an adjustable trial frame 52. The observer views images of the "objects" 103 and 102 with his right and left eye respectively, and, if he has normal vision, the line 102 will appear to pass through "o" in 103. The mirror system may be as shown in Fig 6, comprising two mirrors 54 which may be half-silvered, or as shown in Fig. 1 comprising two glass blocks 10. 12 making a small angle with each other, block 12 being rotatable about the axis PQ: the front surface 12 and the right hand half of the back surface of 10 are silvered. If the mirrors are half-silvered a white screen may be placed behind the mirrors, and viewed through said mirrors. Other test cards are described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3014457A GB854210A (en) | 1957-09-25 | 1957-09-25 | Improvements in or relating to apparatus for use in sight testing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3014457A GB854210A (en) | 1957-09-25 | 1957-09-25 | Improvements in or relating to apparatus for use in sight testing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB854210A true GB854210A (en) | 1960-11-16 |
Family
ID=10303021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3014457A Expired GB854210A (en) | 1957-09-25 | 1957-09-25 | Improvements in or relating to apparatus for use in sight testing |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB854210A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2245982A (en) * | 1990-07-10 | 1992-01-15 | British Aerospace | An optical test device for measuring eye convergence |
-
1957
- 1957-09-25 GB GB3014457A patent/GB854210A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2245982A (en) * | 1990-07-10 | 1992-01-15 | British Aerospace | An optical test device for measuring eye convergence |
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