Do you have contacts?
Yes I have contact lenses to correct my vision.
What do you know about contacts
The most common use is for myopia, hypermetropia, astigmatism and presbyopia. Basically for bad eyesight!
Oh man, is that medical
Well presbyopia happens due to aging of the eye and it gets worse as you get older and you can't focus on close objects.
Oh dang. What else do you know
Refractive error
Refractive error, also known as refraction error, is a problem with focusing light accurately onto the retina due to the shape of the eye. The most common types of refractive error are near-sightedness, far-sightedness, astigmatism, and presbyopia. Near-sightedness results in far away objects being blurry, far-sightedness and presbyopia result in close objects being blurry, astigmatism causes objects to appear stretched out or blurry. Other symptoms may include double vision, headaches, and eye strain.
Near-
Corrective lens
A corrective lens is a lens typically worn in front of the eye to improve vision. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye. Contact lenses are worn directly on the surface of the eye. Intraocular lenses are surgically implanted most commonly after cataract removal, but can be used for purely refractive purposes. 
Prescription of corrective lenses.
Corrective lenses are