Astigmatism Correction is used to correct an eye condition known as astigmatism. In astigmatism, the patient's vision is blurred due to the incorrect shape of the cornea, lens, or eyeball itself (which affects how light reflects onto the retina). Astigmatism can be corrected through contact lenses, glasses, orthokeratology, or surgery. In orthokeratology, rigid contact lenses are used to slowly reshape the cornea of the eye. In the case of surgery, the doctor can reshape the cornea of the eye in order to improve light reflection onto the retina.