With a constant diameter, a looser fit yields sagittal height

With a constant diameter, a looser fit yields sagittal height

• A. Smaller
• B. Larger
• C. Ideal
• D. Unchanged

Answer: (A)

Sagittal height is the vertical distance the lens vaults over the cornea, essentially how much clearance there is between the lens and the cornea at the periphery. When the diameter is fixed, making the fit looser means the lens doesn’t press as snugly against the eye and settles closer to the corneal surface overall. That reduced vault translates directly into a smaller sagittal height. A looser fit isn’t about increasing vault or keeping it the same; it’s about the lens sitting flatter relative to the cornea, so the sagittal height decreases.

Sagittal height is the vertical distance the lens vaults over the cornea, essentially how much clearance there is between the lens and the cornea at the periphery. When the diameter is fixed, making the fit looser means the lens doesn’t press as snugly against the eye and settles closer to the corneal surface overall. That reduced vault translates directly into a smaller sagittal height. A looser fit isn’t about increasing vault or keeping it the same; it’s about the lens sitting flatter relative to the cornea, so the sagittal height decreases.