Nikon D90 - Manual (Page 52)

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Adjust Viewfinder Focus
The camera is equipped with diopter adjustment to accommodate individual
differences in vision. Check that the display in the viewfinder is in focus before
framing pictures in the viewfinder.
1
Remove the lens cap and turn the camera
on.
2
Focus the viewfinder.
Rotate the diopter control until the viewfinder
display and focus point are in sharp focus.
When operating the diopter control with your
eye to the viewfinder, be careful not to put your
fingers or fingernails in your eye.
A Eyepiece Correction Lenses
Corrective lenses (available separately; pg. 239) can be used to further adjust viewfinder
diopter.
Power switch
Focus point