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A cataract is a cloudy area in the lens of the eye that leads to a decrease in vision of the eye. [ 1 ] [ 7 ] Cataracts often develop slowly and can affect one or both eyes. [ 1 ] Symptoms may include faded colours, blurry or double vision , halos around light, trouble with bright lights, and difficulty seeing at night . [ 1 ]
Visual or vision impairment (VI or VIP) is the partial or total inability of visual perception.In the absence of treatment such as corrective eyewear, assistive devices, and medical treatment, visual impairment may cause the individual difficulties with normal daily tasks, including reading and walking. [6]
Blurred vision is an ocular symptom where vision becomes less precise and there is added difficulty to resolve fine details. Temporary blurred vision may involve dry eyes, eye infections, alcohol poisoning , hypoglycemia , or low blood pressure .
Some sources, such as NATO and the U.S. Department of Defense, state that "flash blindness" can be temporary or permanent. [3] Other sources restrict the use of the word to temporary, reversible vision loss, distinguishing it from permanent blindness in a hierarchy of effects: "when the eye perceives bright light one of four reactions may take ...
Ocular hypertension is treated with either medications (eye drops), surgery, or laser. Treatment, by lowering the intraocular pressure, may help decrease the risk of vision loss and damage to the eye from glaucoma. Treatment options include pressure-lowering 'antiglaucomatous' eye drops, surgery, and/or laser eye surgery. [4]
Pressure phosphenes can persist briefly after the rubbing stops and the eyes are opened, allowing the phosphenes to be seen on the visual scene. Hermann von Helmholtz and others have published drawings of their pressure phosphenes. One example of a pressure phosphene is demonstrated by gently pressing the side of one's eye and observing a ...
Particularly when associated with dry eyes, blepharospasm may be relieved with warm compresses, eye drops, and eye wipes. [40] [41] A Japanese study showed that warm compresses containing menthol were more effective in increasing tear film. [42] Drugs used to treat blepharospasm are anticholinergics, benzodiazepines, baclofen, and tetrabenazine ...
Stereoblindness (also stereo blindness) is the inability to see in 3D using stereopsis, or stereo vision, resulting in an inability to perceive stereoscopic depth by combining and comparing images from the two eyes. Individuals with only one functioning eye have this condition by definition since the visual input of the second eye does not exist.