GB2397391A - Computerised testing of distant visual functions - Google Patents
Computerised testing of distant visual functions Download PDFInfo
- Publication number
- GB2397391A GB2397391A GB0301188A GB0301188A GB2397391A GB 2397391 A GB2397391 A GB 2397391A GB 0301188 A GB0301188 A GB 0301188A GB 0301188 A GB0301188 A GB 0301188A GB 2397391 A GB2397391 A GB 2397391A
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- letters
- dvf
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- 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
- A61B3/032—Devices for presenting test symbols or characters, e.g. test chart projectors
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- 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
Apparatus for testing the distant visual functions of a patient includes a large standard flat screen computer display, a standard computer, a remote control keyboard and software capable of generating the required optotypes. The distance between the patient and the display may be 3-6 metres. In small rooms the patient may see mirrored letters through a mirror set 3 metres from the display. The software allows for various tests including those using letters, E-test, shapes, Landolt-C and those using the Snellen's and LogMar principles. Tests on children can use the Sheridan-Gardiner set of letters. The software can provide random letters and shapes and can vary the number, size and contrast of images displayed. Video clips can also be provided for distant fixation. Refraction aids including fan and block, duchrome test are also provided. Distant stereopsis can be assessed using colour or black and white stereograms with the patient wearing either tinted or prism glasses. Tests for diplopia and distant ocular mal-alignments are also provided.
Description
Computerised Testing of Distant Visual Functions
TECHNICAL FIELD
This invention relates to the assessment of distant visual functions in normal individuals and patients.
ASSESS1\lENT OF DISTANT VISUAL FUNCTIONS 1. Assessment of visual acuity: Currently, there are many methods to assess distant visual acuity. These include: A. Snellen's principle B. LogMAR principle Both uses various forms of letters and shapes 2. Assessment of contrast sensitivity This assesses the ability to discriminate different levels of black and white, in the greyscale, contrast usually using letters.
The popular methods for testing the above functions are using electrically illuminated displays, projectors or card charts.
3. Distant stereopsis This is not 'much used nowadays, but might become more popular as practical methods of testing become more available.
A new method described for testing all the above functions using computer technology, which allows more versatile and flexible methods of testing.
PREFERABLE TECHENICAL FEATURES
This invention consists of both hardware and software components: A. Large flat computer display (at least 17"), with computer hardware.
B. Remote control keyboard with operational distance of as far as 6 meters away from the display screen.
C. Necessary driving software.
D. The appropriate coloured glasses or glasses with prisms to view the distant stereograrns.
The device will be to perform the following functions: 1. Testing visual acuity using Snellen's principle.
2. Testing visual acuity using LogMAR principle.
3. Both 1 and 2 tests uses: letters, shapes, letter E and Landolt C 4. Both can be in single or multiple line modes.
5. Number of letters or shapes/line can be varied, between 3-5 letters/line, in LogMAR testing methods.
6. Various alphabet letters can be used to suite different populations.
7. Sheridan-Gardiner screening set of letters.
8. The testing distance can be set to between 3 and 6 meters.
9. Can refresh display with a new set of randomly arranged letters or shapes.
10. The letters (or shapes) size is varied according to the testing distance.
11. I o assess contrast sensitivity using various levels of grey based on the current digital computer greyscale (0-255).
12. Letters can be reversed to allow the use of a mirror in smaller rooms.
13. The device a set to start with the selected preferences. (
Additional system features include: A. Pointing arrows to point at particular test line in multiple lines mode.
B. Flanking rectangle around line in both multiple or single line modes. This can be moved at various lines in multiple lines mode.
C. Distant fixation targets.
D. Playing digital video clips for fixation.
E. Fan and block.
F. Worth 4 dot test.
G. Light spot.
H. Duchrome test.
I. Distant stereo tests - coloured and black and white.
J. Refraction rings.
Other device options: Polarised glasses are if polarised stereograms images are generated on the screen.
TESTING METHODS
The device is set to the required testing distance between 3 and 6 meters. In a small room the device be set at a testing distance of 6 meters and the letters arc mirror reversed using the mirror option. The patient sees the letters through a mirror set at 3 meters from the display screen.
I) Snellen * testing: Any option of letters, E-letter, shapes or LandoltC can be used depending on the literacy of the patient. The charts' construction is based on the current Snellen's principle. In children, illiterate adults, or adults who do not know the English alphabet, shapes and letters E-can be used. Additionally, Landolt-C can be used in adults of the 2 previous categories. Otherwise, letters can be used. This gives the test significant flexibility.
II) Log MAR testing: This test as above stylists letters, shapes, Eletter or Landolt C. The charts' construction is based on the current LogMAR principle.
III) Sheridan-Gardiner test: As currently used in testing children.
IV) Distanf stereopsis test: This can used using colour or black and white stereograms. In coloured stereo the colours red and green (red and light blue) are used and the appropriate spectacles are worn. In black and white prism glasses are worn to help superimpose the stereo images. Polarised glasses are worn if polarised images are used to create the stereo Image palrs.
Contrast sensitivity testing: The device has 8 levels of grey selected from the current computer greyscale, 0 for black and 255 for white. The selection of the greyscale levels is based on (255-2^I), I is increasing variable. On the other hand, the operator can select any level on the greyscale for testing by entering the corresponding number within the above greyscale. The user is able also to construct his/her own test consisting of a set of grey levels as needed. this will give total flexibility to the user.
For this test various options of letters or shapes are displayed in the required grey level. This test will be used as per the current clinical indications of contrast visual acuity testing.
Claims (12)
1. Distant Visual Functions (DVF) tester employs a large flat display screen (17" and above), computer hardware, and remote control keyboard which operates up to 6 meters from the display, tinted glasses, glasses with prisms; and the necessary software to test visual functions of: visual acuity, contrast sensitivity and distant stereopsis in adults and children wherein the distance of testing is variable and be set at a distance between 3-6 meters; with the test using options of letters, Etest, shapes and Landolt-C.
2. DVF tester as claimed in Claim 1 visual acuity testing using Snellen's and LogMAR principles.
3. DVF tester as claimed in Claim 2 wherein testing can be done using Sheridan- Gardiner set of letters for testing children.
4. DVF tester as claimed in Claim 3 wherein these tests can be in single or multiple lines mode.
5. DVF tester as claimed in Claim 4 wherein the number of letters (shapes) /line in LogMAR charts can be varied between 3-5 letters/line.
6. DVF tester as claimed in Claim 5 wherein testing screen display can be refreshed any time with new random set of letters or shapes.
7. DVF tester as claimed in Claim 6 wherein letters can be used to serve various populations in different countries.
8. DVF tester as claimed in Claim 7 wherein contrast sensitivity testing is possible using the current computer greyscale scale 0-255.
9. DVF tester as claimed in Claim 8 wherein distant fixation is possible using various targets for adults and children or playing digital video clips. :
10. DVF tester as claimed in Claim 9 wherein refraction aids are included: fan and block, duchrome test and white rings.
11. DVF tester as claimed in Claim 10 wherein orthoptic tests: worth 4dot test, distant stereopsis test and light spot are featured.
12. DVF tester as claimed in Claim I 1 wherein distant stereo testing can be achieved using colour, polarised, or black and white stereograms
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0301188A GB2397391A (en) | 2003-01-18 | 2003-01-18 | Computerised testing of distant visual functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0301188A GB2397391A (en) | 2003-01-18 | 2003-01-18 | Computerised testing of distant visual functions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0301188D0 GB0301188D0 (en) | 2003-02-19 |
| GB2397391A true GB2397391A (en) | 2004-07-21 |
Family
ID=9951395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0301188A Withdrawn GB2397391A (en) | 2003-01-18 | 2003-01-18 | Computerised testing of distant visual functions |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2397391A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007070954A2 (en) * | 2005-12-20 | 2007-06-28 | Neuro Vision Technology Pty Ltd | Method for assessment and rehabilitation after acquired brain injury |
| CN102068234A (en) * | 2011-02-24 | 2011-05-25 | 江苏省莱科信息技术有限公司 | Vision tester |
| RU2462173C2 (en) * | 2010-06-24 | 2012-09-27 | Закрытое Акционерное Общество Научно-Производственное Предприятие Центр "Реабилитация" (Зао Нпп Центр "Реабилитация") | Device for interactive assessment of visual functions in children of preschool age |
| US8857984B2 (en) | 2005-12-20 | 2014-10-14 | Raymond John Liddle | Apparatus and method for assessment and rehabilitation after acquired brain injury |
| WO2015028721A1 (en) | 2013-09-02 | 2015-03-05 | Ocuspecto Oy | Testing and determining a threshold value |
| CN110507280A (en) * | 2019-08-06 | 2019-11-29 | 桂林理工大学 | A kind of maculopathy assessment of vision method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5121981A (en) * | 1987-11-03 | 1992-06-16 | Mentor O & O, Inc. | Visual acuity tester |
| US5880814A (en) * | 1996-10-30 | 1999-03-09 | Mentor Corporation | Visual acuity tester with improved test character generation |
| GB2355540A (en) * | 1999-10-13 | 2001-04-25 | Univ London | Visual acuity chart display and measurement apparatus |
-
2003
- 2003-01-18 GB GB0301188A patent/GB2397391A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5121981A (en) * | 1987-11-03 | 1992-06-16 | Mentor O & O, Inc. | Visual acuity tester |
| US5880814A (en) * | 1996-10-30 | 1999-03-09 | Mentor Corporation | Visual acuity tester with improved test character generation |
| GB2355540A (en) * | 1999-10-13 | 2001-04-25 | Univ London | Visual acuity chart display and measurement apparatus |
Non-Patent Citations (1)
| Title |
|---|
| Acuity Pro Fact Sheet and Operator's Manual 2002 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007070954A2 (en) * | 2005-12-20 | 2007-06-28 | Neuro Vision Technology Pty Ltd | Method for assessment and rehabilitation after acquired brain injury |
| WO2007070954A3 (en) * | 2005-12-20 | 2007-08-16 | Neuro Vision Technology Pty Lt | Method for assessment and rehabilitation after acquired brain injury |
| US8857984B2 (en) | 2005-12-20 | 2014-10-14 | Raymond John Liddle | Apparatus and method for assessment and rehabilitation after acquired brain injury |
| RU2462173C2 (en) * | 2010-06-24 | 2012-09-27 | Закрытое Акционерное Общество Научно-Производственное Предприятие Центр "Реабилитация" (Зао Нпп Центр "Реабилитация") | Device for interactive assessment of visual functions in children of preschool age |
| CN102068234A (en) * | 2011-02-24 | 2011-05-25 | 江苏省莱科信息技术有限公司 | Vision tester |
| CN105705094A (en) * | 2013-09-02 | 2016-06-22 | 奥斯派克特公司 | Testing and determining threshold value |
| WO2015028721A1 (en) | 2013-09-02 | 2015-03-05 | Ocuspecto Oy | Testing and determining a threshold value |
| CN105705094B (en) * | 2013-09-02 | 2019-12-31 | 奥斯派克特公司 | Testing and determining threshold values |
| US10702141B2 (en) | 2013-09-02 | 2020-07-07 | Ocuspecto Oy | Automated perimeter |
| US10736502B2 (en) | 2013-09-02 | 2020-08-11 | Ocuspecto Oy | Testing and determining a threshold value |
| US10835117B2 (en) | 2013-09-02 | 2020-11-17 | Ocuspecto Oy | Testing and determining a threshold value |
| CN110507280A (en) * | 2019-08-06 | 2019-11-29 | 桂林理工大学 | A kind of maculopathy assessment of vision method |
| CN110507280B (en) * | 2019-08-06 | 2022-06-21 | 桂林理工大学 | Visual chart device with action instruction control |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0301188D0 (en) | 2003-02-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |