Microsoftword

Only available on StudyMode
  • Download(s) : 7
  • Published : May 2, 2013
Open Document
Text Preview
Age- Related Macular degeneration is caused when part of the retina deteriorates. The retina is the interior layer of the eye consisting of the receptors and nerves that collect and transmit light signals from the eye into the optic nerve, then to the brain for interpretation as our sense of vision. The macula is the central portion of the retina and is responsible for detailed vision and color vision, the vision we use to read, thread a needle, sign a check, or recognize faces. http://www.emedicinehealth.com/macular_degeneration/article_em.htm Glaucoma usually occurs when pressure in your eye increases. This can happen when eye fluid isn't circulating normally in the front part of the eye. Normally, this fluid, called aqueous humor, flows out of the eye through a mesh-like channel. If this channel becomes blocked, fluid builds up, causing glaucoma. The direct cause of this blockage is unknown, but doctors do know that it can be inherited, meaning it is passed from parents to children. Glaucoma will cause permanent loss of vision. Without treatment, glaucoma can cause total permanent blindness within a few years. http://www.webmd.com/eye-health/glaucoma-eyes Cataracts occur when there is a buildup of protein in the lens that makes it cloudy. This prevents light from passing clearly through the lens, causing some loss of vision. Since new lens cells form on the outside of the lens, all the older cells are compacted into the center of the lens resulting in the cataract. Vision that is cloudy, blurry, foggy, or filmy Progressive nearsightedness in older people often called "second sight" because they may no longer need reading glasses. Changes in the way you see color because the discolored lens acts as a filter. Problems driving at night such as glare from oncoming headlights. Problems with glare during the day. Double vision (like a superimposed image). Sudden changes in glasses prescription. http://www.webmd.com/eye-health/cataracts/health-cataracts-eyes In most...
tracking img