Impaired vision

By Dillon St.John

Definition

Visual impairment (or vision impairment) is vision loss (of a person) to such a degree as to qualify as an additional support need through a significant limitation of visual capability resulting from either disease, trauma, or congenital or degenerative conditions that cannot be corrected by conventional means, such as refractive correction or medication. http://en.wikipedia.org/wiki/Impaired_vision

Symptoms

Halos which are like glares, blurred vision which would be like the loss of sharpness of vision and the inability to see fine details, and blind spots or scotomas which would like dark "holes" in the vision in which nothing can be seen.

http://www.nlm.nih.gov/medlineplus/ency/article/003029.htm

Causes

  • Blindness
  • Glaucoma
  • Cataract
  • Diabetic retinopathy
  • Age related macular degeneration

Prevention

  • Sunglasses
  • Getting your eyes checked

Treatment

  • Glasses
  • Surgeries
  • Marijauna is used sometimes

Stats

  • Approximately 14 million Americans aged 12 years and older have self-reported visual impairment defined as distance visual acuity of 20/50 or worse. Among them, more than 11 million Americans could have improved their vision to 20/40 or better with refractive correction.
  • In 2002, the age—adjusted prevalence of self—reported visual impairment among Americans aged 50 years and older with and without diabetes was 23.5% and 12.4%, respectively.
  • 2.2 million people have glaucoma (about2% ) among Americans aged 40 years and older

http://www.cdc.gov/visionhealth/data/national.htm

Diagnosis

  • Visual acuity test. A person reads an eye chart to measure how well he or she sees at various distances.
  • Visual field test. Ophthalmologists use this test to measure side, or peripheral, vision.
  • Tonometry test. This test determines the fluid pressure inside the eye to evaluate for glaucoma.

http://kidshealth.org/teen/diseases_conditions/sight/visual_impairment.html# page 3

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