Second. If you wear contacts, dryness is a killer. Hydration is critical; I keep a glass of ice water at my desk at all times. (This also forces you to take

Second. If you wear contacts, dryness is a killer. Hydration is critical; I keep a glass of ice water at my desk at all times. (This also forces you to take brief breaks for the bathroom, which are good for both your eyes and your spine.)