Why does the Khao Manee have odd coloured eyes?
The Khao Manee is genetically a Dominant White (WW or Ww), and it is a feature of this gene to sometimes produce odd eye colours.
Do all Khao Manees have odd coloured eyes?
No. Most have either both blue or both yellow. However the odd color is so impressive that most photos usually feature them.
Are Khao Manees deaf?
Occasionally they may be unilaterally deaf on the blue-eyed side. It is quite common for blue eyed cats to be deaf and is again connected with the Dominant White gene. For further information see http://www.lsu.edu/guests/senate/public_html/deaf.htm