What type of lens will need two separate radiuscope measurements for each lens surface?

Prepare for the Contact Lens Registry Examination with our quiz! Enhance your skills through flashcards and multiple-choice questions, each with detailed explanations and hints. Ace your exam with confidence!

The correct choice is the toric lens, which requires two separate radiuscope measurements for each lens surface due to its shape. A toric lens is designed to correct astigmatism and has different curvatures along two meridians, meaning that unlike a spherical lens, which has the same curvature in all directions, the toric lens has two distinct radii.

Because of this characteristic, practitioners must measure each surface of the toric lens separately to accurately determine its parameters. This ensures that both curvatures are taken into account for proper fitting and vision correction.

In contrast, scratched lenses can impact vision but do not require specific radiuscope measurements as they are fundamentally still spherical or toric in design unless stated otherwise. Heliocentric lenses refer to a specific design or manufacturing process rather than a curvature requirement, and spherical lenses have uniform curvature which only necessitates a single radiuscope measurement.

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