Low vision is a general name given to any and every impairment in vision that affects its performance negatively, and can't be fully corrected by glasses, medicine, eye-drops, or surgery.
Total impairment is named as blindness. Anything less than blindness is called low vision.
Vision is a perceptive field that consists of an angle covering 180 degrees and its acuity in each and every degree of it.
Angle is extensive whereas acuity is the intensive quality of vision.
Now, what is affected in low vision?
Both.
Or may be only one!
Acuity and/or angle are affected by:
Cataract
Glaucoma
Macular Degeneration
Diabetic Retinopathy
Retinitis Pigmentosa
Amblyopia
Corneal Pathology
Hemianopia
Eye Injuries
Enlarged type makes newspapers and magazines easier to read.
Credit: National Eye Institute, National Institutes of Health
Normal Vision
Credit: National Eye Institute, National Institutes of Health
Vision - Glaucoma
Credit: National Eye Institute, National Institutes of Health
Vision - Cataract
Credit: National Eye Institute, National Institutes of Health
Vision - Macular Degeneration
Credit: National Eye Institute, National Institutes of Health
Vision - Diabetic Retinopathy
Credit: National Eye Institute, National Institutes of Health
Vision - Retinitis Pigmentosa
Credit: National Eye Institute, National Institutes of Health
Prevention is always the best line of action, since low vision - once it has affected the eye structure permanently - is irreversible by any means.
And the best line of prevention is vision therapy that increases the eye-immunity against eye-diseases by opening the third eye, resulting in improving acuity as well as angle coverage of the eye in a natural way.
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