When herpes simplex virus (HSV) is inoculated onto the snout of the inbred strain NIH mouse, clinical disease of the eye ensues only after a delay, due to spead of virus to the eye occuring via neural pathways. This report is concerned with the detailed description of eye disease. Physical signs observed include mydriasis, iritis and keratitis. The incidence of combinations of physical signs has been analysed by the computer and presented as pie-charts to show the complexity and evolution of the eye disease.