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Black swirls in your peripheral vision are, in all likelihood, caused by opacities in the clear gel inside of your eye. They are definitely not a symptom of fatigue. The opaque material may be blood or torn tissue inside of your eyeball. You should see an opthalmologist promptly to examine your retina and the other structures inside of your eyeball.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.