What is the effect of poor centration or misalignment on vision with soft contact lenses?

What is the effect of poor centration or misalignment on vision with soft contact lenses?

• A. Miscentering can cause blurred vision, halos, or ghosting due to cylinder misalignment.
• B. It has no effect on vision.
• C. It improves peripheral vision.
• D. It changes lens power automatically.

Answer: (C)

When a soft contact lens sits centered on the cornea, the optical zone lines up with the visual axis so light travels through the intended power of the lens. If the lens is poorly centered or rotated (especially with toric lenses that correct astigmatism), light no longer passes through the intended part of the lens. This creates a mismatch between where the eye is looking and which part of the lens is in front of the pupil, producing blurred vision and sometimes ghosting or halos around lights. For toric lenses, misalignment of the cylinder axis adds residual astigmatism, worsening clarity. This situation does not improve peripheral vision. In fact, the whole image can become less sharp, and vision can fluctuate as the lens settles or the pupil size changes. The lens power isn’t automatically changed by centering issues, so there isn’t any automatic improvement in vision from misalignment.

When a soft contact lens sits centered on the cornea, the optical zone lines up with the visual axis so light travels through the intended power of the lens. If the lens is poorly centered or rotated (especially with toric lenses that correct astigmatism), light no longer passes through the intended part of the lens. This creates a mismatch between where the eye is looking and which part of the lens is in front of the pupil, producing blurred vision and sometimes ghosting or halos around lights. For toric lenses, misalignment of the cylinder axis adds residual astigmatism, worsening clarity.

This situation does not improve peripheral vision. In fact, the whole image can become less sharp, and vision can fluctuate as the lens settles or the pupil size changes. The lens power isn’t automatically changed by centering issues, so there isn’t any automatic improvement in vision from misalignment.