What is a disadvantage associated with soft contact lenses?

Soft contact lenses are known for their comfort and flexibility but can also have certain disadvantages, including low oxygen permeability. This is a critical factor because the cornea needs a sufficient supply of oxygen to maintain its health and transparency. When wearing soft contact lenses made from materials that do not allow adequate oxygen to pass through, this can lead to various complications such as hypoxia (oxygen deprivation) in the corneal tissue.

Low oxygen permeability may also contribute to other issues, such as corneal swelling and irritation, which can lead to discomfort or even long-term damage to the eye if not addressed. It is important for lens prescriptions to consider the oxygen transmissibility of the materials used, especially for extended wear lenses.

While the other options mention potential concerns, such as risks of infection or moisture retention, the fundamental issue of oxygen permeability is more directly linked to the inherent properties of soft contact lenses and their potential impact on ocular health. Thus, understanding the balance between comfort and the need for adequate oxygen supply is crucial for those considering or using soft contact lenses.