Apple AppleVision 1710AV - Manual (Page 49)

In addition to dragging, you can rotate the screen image by clicking the arrow
buttons beneath the picture. Each click makes a small change to the screen
image. To repeat the adjustment, hold down the mouse button instead of
clicking.
5 When you’ve finished rotating the screen image, you can make another screen image
adjustment or close the AppleVision Setup control panel.
Adjusting convergence
Red, green, and blue signals in your display intersect, or converge, to create
the colors you see on your screen. If the convergence is not set properly,
images or text on your screen may appear blurred, or you may get a
“rainbow” effect in which several colors form the edges of images on the
screen.
Over time, you may need to change the convergence to get a clear, distinct
screen image.
To adjust convergence:
1 Press a Control button on the front of your display (or open the AppleVision Setup
control panel from the Apple [
K
] menu).
The AppleVision Setup control panel opens.
35 Adjusting the Screen Image
Click to rotate counterclockwise.
Click to rotate clockwise.