These are known as floaters. Usually floaters are nonpathological.however you must get your fundus examination done by an ophthalmologist first. If it's ok then you need not to worry. Just learn to omit them. And consume lots of fresh fruit and vegetables and some antioxidants.

Hello That moving thing is suggestive of Floaters These appear due to condensation of collagen fibrils present in vitreous cavity of eye These are benign and don't need treatment Only way to get rid of them is to avoid them About redness and watering, this could be due to dryness, allergy etc It is very difficult to comment without examining you Kindly share photos of your eye so that I may guide you better Regards