If a soft diagnostic lens is fitting too flat, what issue might it demonstrate?

When a soft diagnostic lens is fitting too flat, it can create what is known as edge standoff. This phenomenon occurs when the edge of the lens does not adequately settle onto the cornea, which can cause the lens to ride high with a noticeable gap around the peripheral region of the lens.

The reason edge standoff is an issue is that it can lead to reduced comfort and stability for the wearer, as the lens may not properly align with the tear film under the lens. This misalignment can result in decreased visual quality and inadequate movement necessary for health and comfort.

Understanding this issue is essential as it directly affects the performance of the contact lens. If a lens isn't properly adhering to the cornea's contour, it might also lead to issues like reduced tear exchange and increased chances of lens displacement, both of which can compromise the wearer’s experience. The choice of edge standoff reflects an essential consideration in the fitting process, emphasizing the importance of obtaining an appropriate lens curvature for optimal fit.