Strong astigmatism can be better corrected with contact lenses.

Literal

Strong astigmatism [topic-は] contact-lenses [side-のほうが] can-correct.

Uses the comparative ~のほうが to say contact lenses are the better option for correcting strong astigmatism. 乱視 (astigmatism) is a medical term, and 矯正 (correction) is the formal word for optical correction. The potential できます marks ability.