While seeing the occasional floater (which may look like a black or gray spot, ring, or web) drift through your field of vision is normal, seeing a sudden increase of them may indicate a problem. If you experience this symptom, you should visit your eye doctor immediately.
Another form of seeing spots is seeing flashes of jagged lines of light. This can occur spontaneously or after head trauma. They typically last from 10 to 20 minutes and can indicate potential retinal detachment.
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