What is the primary purpose of a Radiuscope?

What is the primary purpose of a Radiuscope?

• A. Measuring the sag
• B. Measuring the base curve of RGP
• C. Measuring the base curve of soft lens
• D. Measuring the peripheral curves of RGP

Answer: (B)

The Radiuscope is designed to measure the radius of curvature of the back surface of a contact lens, which is the base curve of a rigid gas-permeable (RGP) lens. This back-surface curvature is the key factor in how the lens sits on the cornea, affecting centering, tear-film distribution, and overall fit. Knowing the exact base curve helps you select a lens that provides the proper clearance and alignment with the cornea. It’s not used for measuring sag, which relates to lens clearance over the cornea and usually involves different assessment methods; it doesn’t measure the base curve of soft lenses, whose fitting relies on other parameters, and it doesn’t assess the peripheral curves or edges of an RGP.

The Radiuscope is designed to measure the radius of curvature of the back surface of a contact lens, which is the base curve of a rigid gas-permeable (RGP) lens. This back-surface curvature is the key factor in how the lens sits on the cornea, affecting centering, tear-film distribution, and overall fit. Knowing the exact base curve helps you select a lens that provides the proper clearance and alignment with the cornea. It’s not used for measuring sag, which relates to lens clearance over the cornea and usually involves different assessment methods; it doesn’t measure the base curve of soft lenses, whose fitting relies on other parameters, and it doesn’t assess the peripheral curves or edges of an RGP.