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Have you ever noticed something swimming in your field of vision?
你是否會注意到自己的視線中有漂浮物？
It may look like a tiny worm or a transparent blob,
它看起來像是小蟲或者透明液滴，
and whenever you try to get a closer look, it disappears, only to reappear as soon as you shift your glance.
但當你想要更仔細地看它的時候它又消失了轉換視線之后它又會出現。
But don't go rinsing out your eyes!
但你別去沖洗眼睛！
What you are seeing is a common phenomenon known as a floater.
你看的其實是一種常見現象，飛蚊癥。
The scientific name for these objects is Muscae volitantes,
科學界稱之為Muscae volitantes，
Latin for "flying flies," and true to their name, they can be somewhat annoying.
是拉丁語中飛蚊的意思物如其名，它們有時很討厭。
But they're not actually bugs or any kind of external objects at all.
但它們不是真正的蟲或者身外之物。
Rather, they exist inside your eyeball.
它們就存在于你的眼球中。
Floaters may seem to be alive, since they move and change shape, but they are not alive.
因為“飛蚊”會不斷地變形，所以人們會覺得它們是有生命的其實不是。
Floaters are tiny objects that cast shadows on the retina, the light-sensitive tissue at the back of your eye.
“飛蚊”是一種極小的物質，投影于視網膜也就是眼球后部的光敏組織。
They might be bits of tissue, red blood cells, or clumps of protein.
它們可能是小塊組織，紅細胞或是蛋白質團。
And because they're suspended within the vitreous humor, the gel-like liquid that fills the inside of your eye,
由于它們懸浮于玻璃體，也就是眼內的膠狀組織“飛蚊”，
floaters drift along with your eye movements, and seem to bounce a little when your eye stops.
會隨眼球而移動，眼球停止轉動時它又會少許地彈動。
Floaters may be only barely distinguishable most of the time.
“飛蚊”大多數時候不易被察覺。
They become more visible the closer they are to the retina,
當它們靠近視網膜時，
just as holding your hand closer to a table with an overhead light will result in a more sharply defined shadow.
它們變得可看見這就相當于你把手放在吊燈下更接近桌子時手的陰影會更明顯。
