Eye pressure, which is increased in glaucoma, usually doesn't make your capillaries visible (unless you have acute narrow angle closure). Before I go further, you should know that you always have capillaries, it's just that they're not usually visible. Any way, they may become more prominent due to irritants, allergens, dryness, etc. Some inflammatory conditions such as iritis or uveitis can do this but is usualy associated w/pain. Best to consult your optometrist to see if there's any systemic condition that might be doing this. God luck!
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