Certain medical procedures require an injection straight into the vitreous of the eyes. Sometimes, these intravitreal injections can cause air bubbles to form. Until the eye absorbs the bubbles, they will appear as floaters, sometimes persisting for weeks. Ophthalmologists use vitreoretinal surgeries to treat conditions such as macular degeneration, uveitis, and macular holes. Ironically, doctors sometimes also use vitreoretinal surgeries to remove floaters.

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