If you are using a laptop on your desk, elevate it so the screen is at eye level ( A ). Then plug in an external keyboard and pointing device ( B ) so you can type without strain.
Picture courtesy MacWorld 2005
U Slope *Scratch & Dent*
A multipurpose computer writing slope, laptop stand, metal document holder, reading stand and book holder with adjustable angle settings to 45° degrees helps reduce neck and back ache. For single-surface desks.