Companion Animal Eye Center, Ltd.

4708 Olson Memorial Hwy
Golden Valley, MN 55422


Major differentials for acute onset of visual loss include SARDS (sudden acquired retinal degeneration syndrome), retrobulbar optic neuritis, and CNS disease.  PRA (progressive retinal atrophy) is usually not an acute onset.  An ERG is helpful to make a more definitive diagnosis.  SARDS patients usually appear to be in relatively good health, but in some, there is recent history of weight gain, increased water consumption, increased urine output, and increased appetite indicative of hyperadrenocorticism.  Concurrent skin disease has also been reported.  In some cases, elevations in levels of serum alkaline phosphatase, amino transferase, cholesterol, or bilirubin have been noted suggesting subclinical liver disease possibly arising from increased cortisol secretion.  It has been speculated that sudden changes may reflect physiologic stress associated with a retinotoxic factor.