Optometry is the healtch care practice focused on the eyes and vision care. Optometry also diagnoses and treats common eye diseases and disorders such as glaucoma, retinal detachment, macular degeneration, disorders of refractions, cross-eyed tendencies, blindness, color blindness, eye infections, red eye and dry eyes. An optometrist, a provider who diagnoses and treats common eye disorders, prescribes corrective lens (glasses or contact lenses) to correct vision problems.