What effect does excessive thickness have on contact lenses?

Excessive thickness in contact lenses can significantly impair oxygen transmission, which is crucial for maintaining eye health. Contact lenses need to allow a sufficient amount of oxygen to reach the cornea to prevent discomfort and complications such as hypoxia, which can lead to issues like redness, irritation, and even lasting damage to the corneal tissue. Thicker lenses have a greater resistance to oxygen flow, which can hinder the eye's ability to breathe properly. Ensuring an adequate oxygen supply helps maintain clear vision and supports overall eye health, making this a vital factor to consider when fitting patients with contact lenses.