There are several things you can do to be sure you are giving the most accurate responses to the test.
You should be well rested. If you are tired or ill, you should postpone the test.
You should make sure you are seated at the computer monitor as comfortably as possible. The tests takes several minutes to complete in each eye; so comfort is important. Once you find a good posture, try to keep the same posture in all future tests, specially keep the same the distance and angle between your eyes and the computer monitor. The test cannot be paused, so please make sure you are not interrupted while the test is performing.
Close the eye that you are not testing with a patch or with your hand, to be sure that it doesn't interfere when testing the other eye.
The computer monitor and the room brightness should be determined by you once, and kept as unchanging as possible in all following tests. We recommend to set the monitor as bright as possible, and illuminate the room dimly.
It is not possible to test both eyes at once, it has to be performed separately on each eye.
You should always look at the central cross mark, centering the eye being test on front of it. The location of the test lights during the test corresponds to locations on your retina. If you do not look around, VisionField can more accurately determine from the visual field where damage has occurred.
Set the distance between your eye under test and
the monitor, in that way that your eye can see clearly the green circle,
including its perimeter, without need of moving your eye. That distance
should be keep as constant as possible between tests.
The correct distance may change according to your monitor size, but 1 foot is a good starting point for a 17 inches monitor.
To set easily the proper distance between your head and the computer monitor use the Adjust your position menu.
Do not be concerned if you do not see all the lights. With every test, there will be lights that even someone with normal vision will not be able to see.
All eyes have a normal blind spot, where you will get a -1 value in the test. If your tests doesn't show a blind spot, the distance to the monitor may be incorrect or you may be moving you eye around during the test.
Click once to start the test and click again each time you see a light on the screen.
Many times a bad score is caused for lack of concentration throughout the course of the test, only when receiving similar results more than once, the test findings will be validated.
You should get at least two times, the same or very similar tests results, taking both tests in the same day. Having similar results means that you are performing the tests in a consistent way, an so getting reliable results.
After getting the first two reliable test results, delete all previous tests.
The first two tests are always used to set a reference baseline and should be taken in the same day. Precedent tests should be taken at least with 15 days separation, although a month may be a more proper interval.
After having at least four tests ready (the two first reliable test plus other two) you can perform the first Glaucoma Progression Analysis.
Note: Since VisionField evaluation version will work for only 30 days, you should take tests with less than 15 days interval, so you can try the Glaucoma Progression Analysis before the program expires, since you need at least 4 valid tests to run a Glaucoma Progression Analysis. Of course, such analysis will not correctly separated in time, but at least will show you clearly how VisionField works. Of course, if you purchase VisionField, it will not expire ever. Learn More.