Hemeralopia

Hemeralopia, also known as day blindness, is a disorder of the eye that affects the ability of the eye to adjust to changes in light intensity. It is caused by decreased sensitivity of the retina to light. People with the condition have difficulty seeing in bright sunlight or other bright lighting conditions, but have normal vision in dim or dark conditions. It is not a form of complete blindness, but rather a form of decreased visual acuity. The most common cause of Hemeralopia is an inherited condition known as retinitis pigmentosa (RP). RP is caused by a mutation in a gene that is responsible for producing the protein that helps the retina respond to light. Other causes of Hemeralopia include cataracts, glaucoma, and other eye diseases that can affect the retina. Hemeralopia can affect both eyes and may range in severity. Symptoms may include difficulty seeing in bright light, difficulty adjusting to changes in light intensity, and problems distinguishing between colors in bright light. People with Hemeralopia may also experience headaches, eye strain, and fatigue from straining to see in bright light. Treatment for Hemeralopia includes wearing sunglasses and a brimmed hat when outdoors, and avoiding looking directly at bright lights. For more severe cases, glasses with tinted lenses may be prescribed to reduce glare. Surgery may also be an option for some people.