![]() ![]() Other conditions such as a migraine can also cause the sensation of seeing flashing lights.Īt times, a posterior vitreous detachment may occur without associated symptoms. The sensation of flashing lights is not, however always a sign of the vitreous pulling on the retina. These sometimes appear like “lightening streaks” in the eye. The vitreous pulling away from the retina can also cause the sensation of seeing flashing lights. Floaters can also be caused by bleeding or inflammation in the eye. Most of the time, these objects will appear to move. While most often they appear as dots or lines, sometimes they can also appear like circles, clouds, cobwebs or even like a spider or a fly. The floaters can have many different shapes. Although the floaters appear to us to be outside of the eye, they are actually within the eye. As light passes through the vitreous, these small clumps or strands may cast shadows on the retina. Posterior vitreous detachments occur as a normal aging event but may be more common or occur earlier in people who are nearsighted (myopic), have undergone cataract surgery or who have had eye trauma or inflammation.Īs a result of these changes within the vitreous, small clumps or strands may develop in the vitreous. This separation of the vitreous from its attachments to the back part of the eye is called a posterior vitreous detachment. As the vitreous shrinks it may pull away from its attachments to the back part of the eye. Some parts of the vitreous may become more liquefied other parts of the vitreous may condense and start to shrink. As we age, however, changes may occur within the vitreous. When we are young, the vitreous is normally a clear structure which does not affect our vision. The retina then converts this image into neural signals, which are transmitted to the brain.įloaters, flashing lights and posterior vitreous detachment: In the eye, the cornea (a clear structure forming part of the front wall of the eye) and the lens focus light onto the retina where an image is formed. In a camera, light is focused by the lens onto a film, where an image is formed. In some regards, the way in which the eye works may be compared to a camera. The vitreous is attached to the retina in many areas. The vitreous is normally clear and as such will normally not affect vision. The vitreous is a jelly like substance, which fills the center of the eye. The more peripheral parts of the retina provide peripheral vision. The macula is responsible for fine central vision and for color vision. The center portion of the retina is called the macula. The retina is a thin tissue that lines much of the inside of the eye. An understanding of some of the normal anatomy of the eye may be useful in understanding how retinal tears and detachment occur and the symptoms which they may cause. If left untreated, most retinal detachments will lead to loss of vision. Retinal detachment affects approximately 1 in 10,000 people each year.
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