As we age, our vitreous starts to shrink, resulting in collagen fibers clumping together and casting a shadow over the retina. Also known as floaters. If the vitreous pulls away from the back of the eye, it is called posterial vitreous detachment. And floaters most often happen with posterial vitreous detachments. They're not serious, and they tend to fade over time by settling at the bottom of the eye. Think of an eyeball as a snow globe with floaters all the way at the bottom of the eye. If they aren't caused by retinal damage, they may get less noticeable by settling down at the bottom of the eye. And also, our brain learns to ignore them.
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