Taking a closer look at the anatomy of the eye, there is a gel-like fluid called vitreous humor. This fluid is made up of water, collagen, proteins, and a few other materials. Its main function is to fill the space and give our eyes their round shape, much like water in a water balloon.
Normally, the vitreous humor is crystal clear so that when light enters the pupil it reaches the retina at the back of the eye largely undisturbed. However, due to aging, wear-and-tear, and poor eye health, substances in the vitreous humor can start to clump and stay suspended for some time.
Now, when light passes through the pupil the suspended clumps or “floaters” cast a faint shadow on the retina. We see these as small “squiggles” or light shadows in our field of vision. These shadows stay even when we blink or shift our gaze. They are most noticeable when you look at a white or light-colored background. Floaters themselves do not cause any sort of pain or discomfort.
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