My male betta Juju went blind before he died. Does he seem to be running into things? I didn't see a white dot...but I did find one in the right eye of Trinity the swordtail that died recently.
This was him: (the green spots are algae...not in his eye...on the glass)
he isn't running into things at all he tends to go nose down and then lay on the rocks. he eats fine flares so maybe he isn't blind, Iwill take a picture and post it here .