u might be having vitreous floater/ vitreous traction, kindly get it examined by eye specialist ..and specifically yr peripheral fundus..of retina ..for any weak area in it..sometimes there may be a weak area..that doesn'nt pain..and if the traction is severe may lead to a hole in retina..and later on retinal detachment
till then avoid any kind of jerk/concussion
over yr head..please take rest..don'nt bend down..don'nt do exertion/exercises/
do u have minus number/myopia??
tell me if this has helped u in anyway??