-------------Blindness?

1) Blindness- Blindness is the condition of lacking visual perception due to physiological or neurological factors.

2) Types- I mean I have moderate visual impairment but with contacts I can see just fine. Without them...I can't see your hand clearly even if it's two feet away.

"Various scales have been developed to describe the extent of vision loss and define blindness.[1] Total blindness is the complete lack of form and visual light perception and is clinically recorded as NLP, an abbreviation for "no light perception."[1] Blindness is frequently used to describe severe visual impairment with residual vision. Those described as having only light perception have no more sight than the ability to tell light from dark and the general direction of a light source."

3) Cause- Most visual impairment is caused by disease and malnutrition. According to WHO estimates in 2002, the most common causes of blindness around the world are:cataracts (47.9%), glaucoma (12.3%), age-related macular degeneration (8.7%), corneal opacity (5.1%), and diabetic retinopathy (4.8%), among other causes.[14] "

4) You know you have it when your vision is impaired. Trust me hun. If you're blind you either cannot see or have severe trouble seeing.

5) Can it be hereditary? Yes.

i didn't know that blindness is diabetes