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What should I do if I have a fuzzy dark spot in my field of vision?

A moving fuzzy dark spot that suddenly appears in the field of vision is almost certainly a vitreous floater, i.e., an opacity in the clear gel that fills the back part of the eyeball. Floaters commonly appear in middle aged and elderly persons if the vitreous gel undergoes a sudden shrinkage or collapse.
However, if floaters appear for someone in their 20s, this may be associated with a hemorrhage into the vitreous gel or with a hole in the retina. You should have an opthalmologist examine your eyes as soon as possible.

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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.