Final answer:
A cornea that is rough and marred with potholes may exhibit the abnormality of astigmatism. Astigmatism is a vision defect characterized by an unevenness or asymmetry in the focus of the eye.
Step-by-step explanation:
A cornea that is rough and marred with potholes may exhibit the abnormality of astigmatism. Astigmatism is a vision defect characterized by an unevenness or asymmetry in the focus of the eye. It is mostly due to irregularities in the shape of the cornea, which can cause rays passing through different regions of the eye to focus at different distances from the retina, resulting in distorted or elongated images.