If sagittal height is constant, the fit would be

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

Answer: (C)

Sagittal height tells us how tall the lens sits over the cornea—the vault and the tear layer beneath the lens. When this height is kept constant and properly matched to the eye, the lens maintains the right amount of clearance and a balanced edge, leading to a comfortable, stable, and predictable wear. That ideal balance of corneal clearance and edge alignment is what defines an ideal fit. If the vault were too little, the lens would feel tight and crowd the cornea; if it were too high, there could be excessive clearance and edge issues. With the sagittal height correctly set and constant, you’re at the optimal fitting condition, hence the best choice is ideal.