Which statement concerning lens movement is not correct?

The assertion that a loose lens will be considerably more comfortable than a tight lens is accurate, as tight lenses can lead to discomfort due to excessive pressure and lack of adequate tears under the lens. Conversely, a loose lens often allows excess movement, which can lead to sensations that may be bothersome, such as a feeling of instability or constant shifting, potentially causing blurred vision after blinking, as noted in the other options.

A tight lens does indeed cause blanching of the limbal vessels because it restricts blood flow to the area. As a result, the vessels can appear pale or whitened. Additionally, a tight lens may cause scleral indentation, which is the compression of the sclera at the edge of the lens due to the pressure exerted by the lens against the eye. Both of these phenomena indicate the adverse effects of a lens that is too tight.

Thus, while a tight lens produces discomfort and various ocular responses, a loose lens, while initially more comfortable due to less pressure, can lead to other issues, which may not necessarily make it a significantly more comfortable option overall.