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The most common causes of visual impairment globally are uncorrected refractive errors (43%), cataracts (33%), and glaucoma (2%). [1] Refractive errors include near-sightedness, far-sightedness, presbyopia, and astigmatism. [1] Cataracts are the most common cause of blindness. [1]
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]
Retinitis pigmentosa ( RP) is a genetic disorder of the eyes that causes loss of vision. [1] Symptoms include trouble seeing at night and decreasing peripheral vision (side and upper or lower visual field). [1] As peripheral vision worsens, people may experience "tunnel vision". [1]
Central nervous system oxygen toxicity manifests as symptoms such as visual changes (especially tunnel vision ), ringing in the ears ( tinnitus ), nausea, twitching (especially of the face), behavioural changes (irritability, anxiety, confusion), and dizziness.
Other symptoms may include headaches and eye strain. [1] [9] Severe myopia is associated with an increased risk of macular degeneration, retinal detachment, cataracts, and glaucoma. [2] [10] Myopia results from the length of the eyeball growing too long or less commonly the lens being too strong.
30% to 60% of adults (Europe, Asia) [4] Astigmatism is a type of refractive error due to rotational asymmetry in the eye's refractive power. This results in distorted or blurred vision at any distance. [1] Other symptoms can include eyestrain, headaches, and trouble driving at night. [1]
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