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From the treatment that the eye vet has her on, i can presume that she has a condition called 'keratoconjunctivitis sicca' - a mouthful i know, but it describes a condition where the eye cannot produce enough tears and becomes a 'dry eye'- the eye then responds to this by producing a protective layer of pigmented tissue across the cornea (front layer of eye cells), this is then what impairs the vision- as the dogs cannot see properly through the pigmented layer of cells.
The treatment the eye vet has her on should hopefully rectify this- as the cyclosporin will stimulate tear production, and the prednisolone will clear the pigment layer. In addition you may want to use some artificial tears such as 'lacrilube' which you can buy without prescription to help moisturize the surface of the eye.
Hopefully with time, her vision will improve as the pigment clears.