Which of the following indicates a tight lens fit?

A tight lens fit is characterized by restricted movement of the lens on the eye, which can lead to distorted keratometer mires. When the fit of a contact lens is too tight, it does not allow for proper tears to circulate between the lens and the cornea, which is essential for maintaining corneal health and comfort. This tightness can result in keratometry readings showing distortion, as the lens may not align correctly with the curvature of the cornea, leading to improperly shaped mires that appear skewed or altered.

Notably, the other options do not indicate a tight lens fit. Minimal discomfort typically suggests that the lens is fitting well or is comfortably positioned on the eye. Excessive lens movement would indicate a loose fit, where the lens shifts too much during blinking or eye movement. Unchanging vision after prolonged wear can occur for various reasons, but does not specifically indicate a tight lens fit; it may happen with a well-fitted lens that maintains its optical properties effectively.