I think you may be getting some terms confused.
Glaucoma and keratoconus are two different conditions affecting the eye.
Glaucoma refers to damage of the optic nerve (the nerve that goes from each eye to the brain) caused by the natural pressure inside the eye. Glaucoma can occur even with *normal* eye pressure. This large "cupping" of the nerve your doctor mentioned can sometimes be a sign of damage to the nerve, but sometimes it can be normal and healthy. You will need some additional testing to make sure you don't have glaucoma.
Keratoconus refers to a thinning of the cornea (the front part of the eye). This thinning allows the cornea to be pushed outward into a cone-like shape causing very blurry vision. As far as correcting the blurry vision, glasses or contact lenses can usually provide acceptable vision for somebody with keratoconus. In extreme cases, a corneal transplant is usually necessary to allow for clearer vision.
HTH
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keratoconus or glaucoma w/o high eye pressure 
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