Take frequent breaks every 20 mins for 20 secs and look at distant objects. Keep ur pc screen at a level below ur eye level. Avoid direct blow of ac or fan on ur eyes . Use cmc 1% eye drops like refresh liquegel 2-3 times a day. Use protective sunglasses while travelling. Dont worry about the floaters unless the suddenly increase in number or u start seeing flashes of light.  In that case immediately consult a retina specialist.