In a diagnostic fitting set, the center thickness (CT) of the lenses is:

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Multiple Choice

In a diagnostic fitting set, the center thickness (CT) of the lenses is:

Explanation:
In a diagnostic fitting set for gas-permeable lenses, the center thickness is kept the same across all lenses. This standardization makes it possible to compare how different diameters or base curves fit on the eye without thickness getting in the way. Center thickness affects how a lens sits on the cornea, its weight, and how it vaults or moves, so if thickness varied, you wouldn’t be able to tell whether a fitting difference came from the curvature or the thickness itself. By keeping the center thickness uniform, the fitting assessment cleanly reflects the influence of diameter and base curve, not thickness.

In a diagnostic fitting set for gas-permeable lenses, the center thickness is kept the same across all lenses. This standardization makes it possible to compare how different diameters or base curves fit on the eye without thickness getting in the way. Center thickness affects how a lens sits on the cornea, its weight, and how it vaults or moves, so if thickness varied, you wouldn’t be able to tell whether a fitting difference came from the curvature or the thickness itself. By keeping the center thickness uniform, the fitting assessment cleanly reflects the influence of diameter and base curve, not thickness.

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