providing an effective amount of a photosensitive agent to the vessels and thereafter activating {TAIL ~ said agent} in said vessels with a low energy light sufficient to damage {HEAD ~ said vessels}, and 
providing an effective amount of a photosensitive agent to the vessels and thereafter activating { TAIL ~ said agent } in said vessels with a low energy light sufficient to damage { HEAD ~ said vessels } , and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH