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"The appearance of a brown point in the visual field is an optical illusion"

Sometimes occurs in the visual field, a small point that accompanies any movement of the eyeball. But it is not an optical illusion, but a small piece of tissue or an impurity in vitreous humor, located behind the crystalline - representing most of the eyeball. These disturbances disappear eventually by itself. The phenomenon is worrying only when they are perceived unclear clouds or lightning. This may be an indication of a retinal detachment.
Facts from Health