Increasing center thickness will cause decentration to become:

Increasing center thickness will cause decentration to become:

• A. More
• B. Less
• C. No change
• D. Depends on material

Answer: (A)

Increasing center thickness adds weight to the lens. That extra mass shifts the balance of forces under blinking and lid pressure, making the lens less perfectly centered over the cornea. In practice, a thicker center tends to sit off-center more because the tear film and lid squeeze interact with a heavier lens, promoting decentration. While material properties can affect how a lens flexes, the main trend is that greater center thickness leads to more decentration, not less or no change.

Increasing center thickness adds weight to the lens. That extra mass shifts the balance of forces under blinking and lid pressure, making the lens less perfectly centered over the cornea. In practice, a thicker center tends to sit off-center more because the tear film and lid squeeze interact with a heavier lens, promoting decentration. While material properties can affect how a lens flexes, the main trend is that greater center thickness leads to more decentration, not less or no change.