Which of the following is an accurate GP lens fit-type combination?

• A. Steep, Flat, Aligned
• B. Aligned, Steep, Flat
• C. Flat, Steep, Aligned
• D. Steep, Aligned, Flat

Answer: (A)

The main idea being tested is how GP lens fits are described by curvature relative to the cornea and how the lens sits across zones. A gas-permeable lens can be described as steep (base curve steeper than the cornea), flat (base curve flatter than the cornea), or aligned (the lens closely matches the corneal contour across central and peripheral areas for even contact).

Steep, Flat, Aligned is the best example because it covers the typical spectrum a fitter uses: a central curvature that is steeper than the cornea, a flatter (less curved) mid-peripheral contour, and an overall aligned fit where the lens contour matches the corneal shape well. This combination captures central curvature, how the lens transitions toward the edge, and the ideal end state of good alignment, which is why it’s considered accurate for describing a GP lens fit.

Other sequences don’t describe a coherent, commonly used progression of GP fit characteristics as clearly, which is why this option is preferred.