In contact lens fittings, too tight an edge may cause what issue?

In contact lens fittings, a tight edge on the lens can lead to a burning sensation in the eye. This discomfort arises when the lens does not fit properly, restricting movement and potentially exerting pressure on the sensitive tissues of the eye. When the edges of a lens are too tight, they can interfere with tear exchange and the natural blink of the eye, leading to dryness and irritation. This sensation can also be a sign that the lens is not allowing enough oxygen to reach the cornea, further contributing to discomfort. Understanding this impact highlights the importance of proper fitting and comfort in contact lens use.