サムラワールド辞書
(1)
名詞, フレーズ
A condition in which a part of the eye called the vitreous shrinks and separates from the retina. The vitreous is a gel-like substance that fills the inside of the eye ball. The retina is a light-sensitive area at the back of the eye.
例
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If you see dark specks or flashes of light, it's possible you could have posterior vitreous detachment (PVD), an eye problem many people have as they age.