"Dont spend much time in front of the computer" is the doctors guidance (and its not just words). One of the main problems of sedentary work is the blood stagnation in the pelvic area, as well as vision deterioration due to immobility and eye strain.
A perfect prevention would be tearing your back of the chair, warming up and walking (even IF IT means walking from one room to another). You can also do some sit-UPS or jog in place. And dont forget the special warm-up for your eyes!
STAND App will remind you to take a break.
Set the notification interval from 5 to 60 minutes, and dont forget to warm up.