found a white dot thread on arofanatics.com
http://www.arofanatics.com/forums/showthread.php?t=422146
for those that dont have an account:
"Regarding this white dot in the eye, I was ever told by a Vet it's due to catarracts. However, this could be one of the reasons for the white dot.
I was also told that this may be genetic for some fishes, as to whether it is a health problem I am really not sure now. If it occurs in all the fishes in a farm and there is no problem of blindness in the fish, then this theory that all white dots are signs of catarracts may not be entirely accurate."
"It is commonly called "crystal or diamond eyes".To me,it is a defect as i was told by senior sifus that it is akin to cataracts in human.Higher chance of going blind!!Hope this helps!!"