As we all know that dilated pupils can indicate one's good mood. When you are fearful or aggressively excited, your pupils will dilate.High blood pressure, or hypertension, in human beings commonly results from other medical problems such as kidney disease. High blood pressure can cause the eyes to swell and bleed, often resulting in blindness. Retinal detachment, caused by major head trauma, can also occur, causing blindness. Most times, a cat will be asymptomatic (no symptoms). However, when signs and symptoms do appear, a person may have visual impairment, lethargy, depression and seizures.