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为什么你有浮动的事情在你的眼睛吗

新闻来源:admin 发布时间:2018-09-20

floating stuff in your eye

If you ever stared into the blue sky or even a blank computer screen, you might have noticed there are some  strange blobs floating through the field of vision。  These might look like black or gray specks, strings or cobwebs that drift about when you move your eyes, but kind of disappear when you try to concentrate your vision directly onto them。 So, what are we actually seeing? Time to dispel another childhood superpower。 No, these aren搜狐娱乐’;t aliens trying to make contact or microbes。 Nor are they hallucinations, for make no mistake the spots are completely real and there。 These spots in your vision are called by doctors eye floaters and are caused by the  blue field entoptic phenomenon

What those little blobs in your eye really are

The retina is a light-sensitive layer at the back of the eye that covers about 65 percent of its interior surface。 This is where special cells called cones and rods sense incoming light and pass the signal to the brain where the information is decoded as vision。 But this is also an area littered by blood capillaries, which ensure a constant flow of oxygen to the eye。 These capillaries sit right in front of the retina, and while they’;re very narrow –; so narrow that cells need to travel in single-file through them –; these block incoming light and actually cast a shadow。 Now typically the brain is adapted in such a way that it singles out the capillaries and corrects for the light they’;re blocking, so we usually see clear and wide。

Stare into this blue field image to see the ";alien blobs"; or floaters。

Stare into this blue field image to see the “;alien blobs”; or floaters。

That’;s not all to the story, obviously。 On occasion, a white blood cell comes through the capillary’s cellular parade。 These are much bigger than the tiny red blood cells and leave  blue light through, causing a lack of shadow matching。 Because they’;re so big, they actually have to squish through the capillary walls to travel and become elongated。

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