When using a radioscope, which region must the CL fitter move through before seeing the spoke pattern?

The correct answer is that the contact lens fitter must move through the filament region before seeing the spoke pattern on a radioscope. In the context of contact lens fitting, the filament region is crucial as it corresponds to the light source's interaction with the tear film and the lens itself.

As the fitter adjusts the positioning of the lens in relation to the eye, the radioscope highlights the distribution of light, allowing for the observation of the spoke pattern that indicates the lens's fit. This pattern is essential for assessing the interaction between the contact lens and the corneal surface, as it helps determine whether the lens is aligned properly, centered, and providing adequate vision correction while still maintaining comfort for the patient.

Understanding the filament region's role is vital for accurate lens fitting. The fitter must be adept at interpreting these patterns for successful fitting outcomes, ensuring the lens conforms properly to the individual's corneal shape.