A subconjunctival hemorrhage occurs when a tiny blood vessel breaks just underneath the clear surface of your eye (conjunctiva). This looks much worse than it really is. There’s usually no obvious harm to your eye and there’s no treatment.
Even a strong sneeze or cough can cause a blood vessel to break in the eye. It will disappear within two weeks.
When I see this, I will check your vision and look inside the eye for any damage. If it keeps happening, I would order complete blood work with a basic metabolic panel to make sure there’s no underlying systemic condition.