Which component is corrected by toric lenses in cases of significant astigmatism?

Which component is corrected by toric lenses in cases of significant astigmatism?

• A. Cylindrical power and axis
• B. Spherical power only
• C. Color tint
• D. Base curve

Answer: (A)

Astigmatism comes from an uneven curvature of the eye, causing light to focus at different points along different meridians. To fix this, toric lenses add a cylindrical power that changes the refractive power in one meridian compared to the perpendicular one. The axis specifies the orientation of that cylinder on the lens, so the correcting power lines up with the eye’s meridians. By combining spherical power (for overall focus) with the cylindrical power oriented at a precise axis, toric lenses correct the uneven focusing caused by astigmatism. So the part that toric lenses adjust in cases of significant astigmatism is the cylindrical power and its axis. Spherical power alone wouldn’t address the uneven curvature, color tint is cosmetic, and base curve relates to how the lens fits rather than correcting astigmatism.

Astigmatism comes from an uneven curvature of the eye, causing light to focus at different points along different meridians. To fix this, toric lenses add a cylindrical power that changes the refractive power in one meridian compared to the perpendicular one. The axis specifies the orientation of that cylinder on the lens, so the correcting power lines up with the eye’s meridians. By combining spherical power (for overall focus) with the cylindrical power oriented at a precise axis, toric lenses correct the uneven focusing caused by astigmatism.

So the part that toric lenses adjust in cases of significant astigmatism is the cylindrical power and its axis. Spherical power alone wouldn’t address the uneven curvature, color tint is cosmetic, and base curve relates to how the lens fits rather than correcting astigmatism.