reddened human eye with many distinct blood vessels

allergic allergy artery blepharon blood bloodshot bloody capillary concept conjunctiva conjunctivitis corneal disease eye eyeball eyelid health human infected infection inflamed inflammation injured irritated irritation itchy medicine ophthalmological ophthalmology opthalmology pollen problem pupil red reddened redness retina retinal sensitive sick sore symptoms system tired tiredness treatment vector vein vessel visual