Most soft lenses come in only one (maybe two) base curves.

• A. True
• B. False
• C. Sometimes
• D. Never

Answer: (A)

Base curve refers to the back-surface curvature of a soft contact lens and how tightly the lens sits on the cornea. Soft lenses are made from flexible materials, so they can adapt to small variations in corneal shape without causing the same rigid-fit issues you’d see with hard lenses. Because of this forgiving nature, most soft-lens lines use a single base curve for the entire family. This single curve fits the majority of wearers well, keeping production and fitting straightforward.

There are cases where a second base curve is offered for a lens line to accommodate flatter or steeper corneas, which is what the “maybe two” part acknowledges. If a wearer doesn’t fit well with the default curve, a clinician can try the alternate curve to improve comfort and alignment.

So the statement is true: most soft lenses come in only one base curve, with some lines offering a second option for exceptional fit needs.