When inspecting the blend on the bevel of a GP lens, what should be observed?

When inspecting the blend on the bevel of a GP lens, observing a J-shaped or ski pattern is indicative of proper lens design and comfort during wear. This pattern reflects how the lens design has incorporated blending techniques at the edge, which helps to facilitate a smoother transition from the lens surface to the adjacent areas of the eye. Such a design minimizes edge thickness and prevents irritation, enhancing the overall comfort for the wearer.

A J-shaped or ski pattern also suggests that the lens edges have been well-designed to promote stability and reduce the likelihood of lens displacement during blink. This kind of blending ensures that the lens aligns properly with the corneal curvature while providing a seamless edge transition that minimizes visual disturbances.

Other choices represent undesirable conditions or features of the lens edges. A rough edge could lead to discomfort and irritation, a perfectly smooth curve might indicate a lack of adequate blending which could compromise fit, and a stepped appearance would suggest poor manufacturing practices that could negatively impact lens performance. Thus, the presence of a J-shaped or ski pattern is a sign of a well-manufactured GP lens that will likely provide the wearer with the needed comfort and visual acuity.