Which eye condition is due to an irregular shape of the cornea?

Which eye condition is due to an irregular shape of the cornea?

• A. Myopia
• B. Hyperopia
• C. Astigmatism
• D. Conjunctivitis

Answer: (C)

Irregular curvature of the cornea leads to astigmatism, a refractive error. When the cornea isn’t evenly curved, light rays entering the eye focus at different points on the retina along different meridians. This creates blurred or distorted vision at all distances because there isn’t a single clear focal point. This is different from nearsightedness or farsightedness, where the eye’s overall focusing power is too strong or too weak, causing the image to land in front of or behind the retina. Conjunctivitis, on the other hand, is inflammation of the conjunctiva and doesn’t involve the corneal shape or a refractive error, so it doesn’t cause the same type of vision blur. Astigmatism is typically corrected with cylindrical lenses or toric contacts (or refractive surgery) to balance the curvature and create a single focal point on the retina.

Irregular curvature of the cornea leads to astigmatism, a refractive error. When the cornea isn’t evenly curved, light rays entering the eye focus at different points on the retina along different meridians. This creates blurred or distorted vision at all distances because there isn’t a single clear focal point. This is different from nearsightedness or farsightedness, where the eye’s overall focusing power is too strong or too weak, causing the image to land in front of or behind the retina. Conjunctivitis, on the other hand, is inflammation of the conjunctiva and doesn’t involve the corneal shape or a refractive error, so it doesn’t cause the same type of vision blur. Astigmatism is typically corrected with cylindrical lenses or toric contacts (or refractive surgery) to balance the curvature and create a single focal point on the retina.