Why does this happen?

Diab px mid 50s presented with painful right eye (better Today) for last 3/7- amb eye but still 6/12. Iop 20 (no change) and g1 ac cells.  hx of DED, no cls/trauma etc Just wanted some comments on diagnosis/tx/management and pathophysiology.   Here some pics.  https://www.dropbox.com/s/vjhumn76h6jen22/photo%2007-12-2015%2011%2050%2028.jpg?dl=0 https://www.dropbox.com/s/a9nmiremd6khalr/photo%2007-12-2015%2011%2050%2021.jpg?dl=0   Irfan