My 11 yr old Lhasa Apso has very bloodshot eyes and little by little has appeared to go blind. His eyes have that blue tint you see in older dogs as well. Could he have an infection or could this be permanent? I called my vet about it he suggested a few very expensive tests to check it out.
This breed is prone to corneal ulcers and with this you may see a cloudiness of the cornea, red conjunctiva, squinting,rubbing at the eye and mucus or pus draining from the eye. Treatment can be drops to prevent infection, atropine to relieve inflammation or surgery. You can read more on this here. http://www.petplace.com/dogs/corneal-ulceration-in-dogs/page1.aspx
This could also be cataracts as that will show a bluish hue to the eye. If it is cataracts then there is not treatment except surgery and usually a vet will wait until it hits a certain stage. http://www.petplace.com/dogs/cataracts-in-dogs/page1.aspx
24 years training & behavior,pet first aide, Therapy dog eval., PA Animal Response Team