The walls of these vessels leak fluid, which causes {HEAD ~ scarring} in the surrounding tissue and results in {TAIL ~ reduced vision} or loss of vision 
The walls of these vessels leak fluid , which causes { HEAD ~ scarring } in the surrounding tissue and results in { TAIL ~ reduced vision } or loss of vision
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH