Horner's Syndrome: Loss of sympathetic nervous system input to (in this case) right eye. Note that right pupil is smaller than left. Also that right eyelid covers a greater portion of eye than on left (known as ptosis). The etiology in this case was due to tumor infiltrating the sympathetic chain. Charlie Goldberg, M.D. - UCSD Catalog of Clinical Images #Clinical #Ophthalmology #Photo #Horners #Syndrome #Ptosis #UCSDH