Prentke Romich Company
http://www.prentrom.com/support/article/1743
NuEye System Parameters
The NuEye has an imaginary "eyebox" that measures approximately 10" x 12" x 9". As long as the eyes are within this area they are in the view range of the NuEye system. At this time the user should be positioned somewhere between 18 and 29 inches from the Accent display screen. ÜIf you move in and out of the view area, the system will "remember" you. This means that once you set up the system you should not have to recalibrate it because of body movement.
Being able to meet these positioning requirements will help you achieve success with the NuEye system:
1. You must have one eye (preferably two) within the eyebox.
2. You should be at least 18 inches from the Accent display screen but can be as far away as 29 inches.
3. Your nose must be aimed at, or slightly above, the midpoint or upper 2/3rds of the display screen.
4. Your face must be straight-on and/or parallel to the display screen. If you are tilted due to positioning or posture, the Accent must be tilted at a similar angle so that your face is directly in front of and at least 18 inches away from the display.
5. There can be no obstructions between your face and the Accent and NuEye system.
Mount your communication device with the eyegaze unit on your wheelchair mount or table stand.
If the User is Wearing Glasses
Initially, when positioning the camera for a user who wears glasses, you will most likely see much larger bright dots around the eyes. These indicate that the eyegaze unit is seeing only the reflections from the user’s glasses.
In the camera image above,you can see three white blobs. This is the reflective glare coming from the user’s glasses. The Track Status Box has nothing in it which tells you that the camera is not able to see anything to track.
In this case, you must work at positioning the user and/or device until there is no glare coming from the glasses and the Track Status Box shows you some feedback.
In this image the reflective glare is gone from the glasses. Notice that the angle of the nose is slightly different in this image—you see more up the nose than at the nose. However, the Track Status Box shows two white circles near the center of the box, so this is the correct positioning for this user. The angle had to be changed slightly in order to remove the reflective glare.
When you are satisfied with the positioning, select the OK key in the bottom right of your display screen.
You received a Positioning Shim with your eyegaze unit. This allows you to tip your eyegaze unit up or down 5 degrees. If you find that you can’t seem to achieve correct positioning, try adding the shim to the eyegaze unit.
Note: Be aware that certain lighting and reflections can also effect the use of the NuEye. Items such as a glass top desk, white counter top or even fluorescent lighting can hinder accuracy.