Well, it is possible that concussion can cause retina detachment. A minority of retinal detachments result from concussions to the head. The retina detachment can be divided into three types: rhegmatogenous retinal detachment, educative, serous, or secondary retinal detachment, tractional retinal detachment. While tractional retinal detachment can be caused by an injury, or inflammation. According to a retrospective Indian study of more than 500 cases of rhegmatogenous detachments found that over 50% after the inciting injury can lead to tractional retinal detachment. By the way, if you get detached retina, you should accept treatment as soon as possible. Detached retina is really harmful to eye health and you'll loss some vision gradually and then only can see a whole dark world without any treatment on it.