Blindness is the inability to see things, including light. It can be partial or complete. Blindness is strictly defined as the state of being totally sightless in both eyes.
A completely blind individual is unable to see at all. The word blindness, however, is commonly used as a relative term to signify visual impairment, or low vision, meaning that even with eyeglasses, contact lenses, medicine or surgery, a person does not see well. Vision impairment can range from mild to severe.
Worldwide, between 300 million and 400 million people are visually impaired due to various causes. Of this group, approximately 50 million people are totally blind, unable to see light in either eye. Eighty percent of blindness occurs in people over 50 years old.
Common causes of blindness include diabetes, macular degeneration, traumatic injuries, infections of the cornea or retina, glaucoma, and inability to obtain any glasses.
Below are the three early symptoms of blindness:
Difficulty seeing: People with similar levels of visual loss may have very different responses to that symptom.
lack of sight: People who lose their vision suddenly, rather than over a period of years, also can have more difficulty adjusting to their visual loss.
Discomfort in the eyes: Awareness of the eyes, foreign body sensation, and pain in the eyes or discharge from the eyes may be present or absent, depending on the underlying cause of the blindness.
Other symptoms of blindness?
If you’re completely blind, you see nothing. If you’re partially blind, you might experience the following symptoms:
- cloudy vision
2. an inability to see shapes
3. seeing only shadows
4. poor night vision
5. tunnel vision