Visual Field Test - Eye Chart Features
1) Visual field test
- Automatic blind spot detection.
- Camera to monitor the patient during the exam.
- Patients database, appointments, exams thumbnails.
- Checks fixation loss during exam and pauses the exam if fixation is lost.
- Stimulus size: Goldmann size III
- Exposure time: 200 ms
- Strategies: Full Threshold 4-2, 4-2-1 / Fast Threshold 3 (fast) db steps visual field test.
- Visual field tests: Glaucoma 30º / 76 points, 24º / 52 points
- To increase efficiency starts with the measurement of eight 'anchor points' near the center of each quadrant.
- The starting point for the surrounding points are calculated from the slope of the hill of vision, rather than restarting at the normal values for every location.
- Re-tests are used to obtain an indication of response reproducibility using a set of fixed test locations
- Variable stimulus rate, adapted to patient's response time.
- Negative answers are checked twice (in case the patient blinked).
- Statistics: Test points, false positive, false negative, fixation losses, short fluctuation, mean sensitivity.
- Cost effective.
2) Eye chart
- Scales: Snellen / Monoyer
- Charts: Numeric, E, Landolt C, children,
- Masks: Vertical, horizontal, single point, red-green, astigmatic
- Working distance 2.8 to 6.8 metes, adjustable
- Remote control : IR or pda
3) Patient Database
- Select, insert, update, delete, search medical records (unlimited number)
- Medical images
- Appointments - calendar
- Password protection and data encryption
- MsAccess or MsSQL database
Hardware requirements for visual field testing
A computer with a dual output video card, two usb mice, a monitor to control the application and a second LCD/plasma monitor or a LCD/DLP projector (a wide angle or short throw projector is recommended, as it requires very little space and can be sited very close to the screen eliminating shadowing effects caused by patient in front of the screen).