I feel that I have a visual impairment but technically an impairment cannot be fixed with regular glasses or contacts. I can see with contacts. 
I am near sighted so I have to wear glasses to drive.
I understand. I have to wear them or contacts to eat a plate of food in front of me and see across the street, but I can see really close up perfectly. Now people sometimes include those who dont have contacts and glasses or access to them to be visually impaired as well. They are uber expensive!
Yeah my glasses costed me a little over 300 so I feel your pain.
Yes it is crazy how expensive it is just to be able to see when some people can just like..... wake up in the morning and see? Lol. Theres all kinds of varietys like you said near sighted, astigmatism, far sighted, and presbyopia.
What is presbyopia? I have never heard of that?
Oh yeah that is where the eye is progressively worsening ability to focus on close objects clearly commonly associated with aging of the eye.
That sounds terrible, people with perfect vision dont know how lucky they have it.
I agree, its like a right everyone should have yet so hard to obtain the tools needed to maintain it. Visual impairment can also occur because of damage to the brain from trauma, a stroke or premature birth.
I dont have any of those so it must just be bad eyesight.