Floaters are small particles, deposits of various size, shape, consistency, refractive index, and mobility that move in the vitreous humor, substance the thick fluid or gel that fills cavity of the eye, which is normally transparent. These particles cast a shadow on the back of the eye causing them to appear as small spots, cobwebs or lines. It is common and usually causes no harm to the eye. Sometimes stringy clumps of opaque cell fragments can develop and float around in the vitreous humor. However, floaters that come on suddenly or occur with flashes of light can be a symptom of a serious medical eye problem. It may be more common in people with severe nearsightedness or diabetes.
The common type of floater, which is present in most people’s eyes, is due to degenerative changes of the vitreous humor. It is visible because of the shadows they cast on the retina or refraction of the light that passes through them, and can seem alone or together with several others in one’s visual field. They may appear as spots, threads, or fragments of cobwebs, which float slowly before the observer’s eyes. Since these objects exist within the eye itself, they are not optical illusions but are entropic phenomena. It often interrupts this stabilization, especially when they tend to stay visible. In some cases, floaters are congenital.
Eye floaters move as the eyes move. They generally seem to dart away when you try to focus on them.
It can appear in many different shapes, such as:
Black or gray dots
Thread like strands, which can be knobby and semi-transparent
Once develop they usually do not go away, though they tend to improve over time.
It occurs when the vitreous gel thickens or shrinks due to aging, causing particles to form in the gel. These particles block the light passing through your eye, casting shadows on the retina. The shadows are seen as floaters, which can be created by:
The formation creates protein clumps in the vitreous gel.
Floaters are often readily observed by an ophthalmologist or an optometrist with the use of an ophthalmoscope or slit lamp. However, if the floater is near the retina, it may not be visible to the observer even if it seems large to the sufferer.
Increasing background illumination or using a pinhole to effectively decrease pupil diameter may allow a person to get a better view of his or her own floaters. The head may be tilted in such a way that one of the floaters drifts towards the central axis of the eye. In the sharpened image the fibrous elements are more conspicuous.
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