Sudden Acquired Retinal Degeneration (SARD)
SARD occurs in dogs. Clinical findings include acute loss of vision (often occurring throughout several days), widely dilated and poorly responsive to nonresponsive pupils, and a normal-appearing ocular fundus. Dogs affected most often are middle-aged and sometimes have liver disease and hyperadrenocorticism with clinical signs of weight gain, polyuria, polydipsia, and polyphagia. Electroretinography indicates loss of outer retinal function; complete retinal and optic nerve degeneration becomes apparent ophthalmoscopically throughout several weeks. There is no effective treatment.