For your eyesight:
The 20-20-20 rule: Every 20 minutes, look away from the monitor to a spot at least 20 feet away for at least 20 seconds.
Special computer prescription: You can get a special prescription for computer work based on your current Rx that will help with eye strain issues.
RSI: Swimming (the TotalImmersion way). Beware that any pain in the lower arm extremities may be a symptom of problems upstream (e.g. shoulder/back - try rolling your shoulders)
Roids: Splash cold water on affected area, ideally right after you-know-what
Favorite healthy snack: Formula = Carbs + Protein (e.g. whole wheat no-preservative bread with natural Trader Joe's peanut butter or apple slices with peanut butter)