Hemeralopia
Hemeralopia (pronounced: heh-meh-rah-loh-pee-ah) is a medical condition characterized by reduced vision in bright light, compared to vision in low light conditions. The term is derived from the Greek words 'hēmera' meaning 'day' and 'alopsía' meaning 'blindness'.
Definition
Hemeralopia is a condition where an individual experiences difficulty seeing in bright light. This condition is the opposite of Nyctalopia, which is characterized by impaired vision in low light or at night. Hemeralopia can be a symptom of several eye diseases, including Cataracts, Cone Dystrophy, and Retinitis Pigmentosa.
Symptoms
The primary symptom of Hemeralopia is difficulty seeing in well-lit environments. This can include both indoor environments with artificial lighting and outdoor environments on sunny days. Other symptoms can include a general sensitivity to light, often referred to as Photophobia, and a decrease in visual acuity.
Causes
Hemeralopia can be caused by a variety of conditions. It is often associated with diseases that affect the Retina, the light-sensitive layer at the back of the eye. These can include Cataracts, which cloud the lens of the eye, Cone Dystrophy, a group of eye disorders that affect the cone cells in the retina, and Retinitis Pigmentosa, a genetic disorder that causes the cells in the retina to break down and die.
Treatment
Treatment for Hemeralopia depends on the underlying cause. For example, if Hemeralopia is caused by cataracts, treatment may involve cataract surgery to replace the clouded lens with an artificial one. If the cause is a retinal disease, treatment may involve managing the disease to slow its progression and alleviate symptoms.
See Also
External links
- Medical encyclopedia article on Hemeralopia
- Wikipedia's article - Hemeralopia
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