What is the appropriate action to take when there is insufficient tear exchange with a contact lens?

When addressing insufficient tear exchange with a contact lens, the most effective action is to decrease the optical zone for a looser fit. This approach increases the lateral movement of the lens during blinking, which can enhance tear exchange beneath the lens. Improved tear exchange allows for better lubrication, oxygenation, and waste removal, which are critical for maintaining corneal health and comfort while wearing contact lenses.

Reducing the optical zone can create additional space for tears to flow beneath the lens, promoting better hydration and overall lens performance. Adjusting the fit in this manner can alleviate discomfort associated with dryness, ensuring that the lens sits correctly on the eye without significantly compromising vision or lens stability.

In contrast, other options may not effectively address the issue of insufficient tear exchange. For instance, changing to a thicker lens might inadvertently restrict movement and tear exchange further. Switching to a daily disposable lens could provide benefits for hygiene and comfort but does not specifically target the problem of tear exchange with the current lens. Similarly, increasing the lens diameter does not directly influence tear exchange and could lead to other fitting complications.