This requires a careful dilated examination of the retina to look for tears, or other areas which may be at risk for tearing. The important thing is to determine that the retina is healthy as the vitreous detaches. These symptoms usually resolve over a period of days to weeks, although some people will continue to see the floaters for a longer period of time. Sometimes this is described as a cobweb, a net, a string, or a fly over the vision. Debris pulled off of the optic nerve and retina are then seen as floaters, suspended in the vitreous above the retina. It may occur especially with eye movement, since the vitreous moves in the eye. This is perceived as a flash of light, similar to a lightning flash in the corner of the vision. As the vitreous detaches, it tugs on the retina and optic nerve. This is generally a normal process, although it may happen abnormally early in cases of high nearsightedness or trauma. When this occurs, usually between age 50 and 70, the back edge of the vitreous will pull forward away from the optic nerve and retina, leading to a "posterior vitreous detachment". At some point in a person's life, the vitreous liquefies enough to shift position in the eye. The vitreous has loose attachments to the retina, and more firm attachments to the optic nerve. As people age, this vitreous becomes more and more liquefied. The vitreous is a gel-like fluid which fills most of the eye. Sometimes after cataract surgery with lens implants, light might strike the lens implant at a certain angle that might cause a flash in the peripheral vision, and sometimes light might strike a lens implant in such a way that it can appear reflective to another person looking at the pupil of the eye. Sometimes flashing might also be seen with head or eye movement. It is important to distinguish the nature of the flash, as one type of flash is very brief and transient, like a lightning bolt, and other flashes are more continuous and can last for minutes or hours. This is rarely seen as a normal visual phenomenon throughout life. "Flashing" is a symptom of seeing a flash of light in the vision. Similarly, except in cases of severe trauma, objects cannot enter the eye from the outside to cause floaters. Note that something floating in the tear film of the eye or a foreign body on the surface of the eye will not be visualized as a floater (although it might blur the vision). The examining doctor can often actually visualize what the new floater is during an eye examination. Sometimes they are described like cobwebs in the vision. These new floaters might also be nearly transparent, but they may appear more like gnats or insects flying in the vision or crawling on the floor. People that have this normal variation are generally familiar with its appearance to them, and it usually changes very little throughout life.Ī change in floaters or a new floater is reason for concern, as it can be associated with disease conditions within the eye, especially if associated with flashes of light. What is being seen in this case is most likely the remnant of a vessel that existed between the optic nerve and lens of the eye before birth, which degenerates into a nearly transparent "worm-like" opacity that moves about in the vitreous. Many people are born with "floaters" that they see from time to time, especially when looking at a blank background or laying back looking at a bright daytime sky. However, this phrase could also be used to describe the physical sensation of something irritating the surface of the eye (a foreign body sensation), and if the meaning of this phrase is not clarified, the wrong diagnosis could be made. Some people use the phrase, "I feel like there is something moving in my eye". It is important to be careful and very specific in how this is described as the description itself can help lead to the proper diagnosis. "Floater" is a common term referring to seeing abnormal spots moving in the vision. Separate sections on Rainbows, Abnormal Color Vision, Distorted Vision, and Tunnel Vision follow. The first grouping of abnormalities give symptoms of floaters or flashing lights. Other visual abnormalities such as seeing rainbows around lights, abnormal color vision, and distorted vision are discussed as well. This page discusses unusual visual phenomenon such as floaters and different types of flashing lights. Floaters, Flashing lights, Rainbows, Abnormal Color Vision, Distorted Vision Ocular Symptoms and Conditions: Floaters, Flashing lights, Rainbows, Abnormal Color Vision, Distorted Vision
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