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