Astigmatism: Pathogenesis and clinical findings Astigmatism - deviation from spherical curvature of the lens or eye Refracting power of the cornea is different in one meridian than in another => • With the rule astigmatism: cornea is steepest in vertical meridian -> Light rays from vertical meridian form horizontal line foci • Against the rule astigmatism: cornea is steepest in horizontal meridian -> Light rays from horizontal meridian form vertical line foci => Parallel rays of light passing through the cornea are brought to different points of focus on the retina • Reduced visual acuity • Distortion Of Vision • Headache • Ocular fatigue #astigmatism #pathophysiology #ophthalmology
