SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Macular degeneration. Coloured computed tomography scan of the eyes of a 54 year old female patient with bilateral age-related macular degeneration (AMD). Drusen spots (yellow) are seen on the retina of both eyes. The macula is the area of the retina, the light-sensitive membrane at the back of the eye, responsible for central vision, which is the sharpest. It is not known what causes macular degeneration, although old age, poor nutrition and overexposure to the ultraviolet radiation in sunlight have all been implicated. The main symptom is a loss of central vision, meaning reading and delicate tasks become difficult or impossible. Some distortion of peripheral vision may also occur.
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