What happens to oxygen reaching the cornea as the center thickness of the lens increases?

What happens to oxygen reaching the cornea as the center thickness of the lens increases?

• A. It remains constant
• B. It decreases
• C. It increases
• D. It is unaffected

Answer: (B)

As the center thickness of a contact lens increases, the amount of oxygen that reaches the cornea generally decreases. This occurs because a thicker lens creates a greater barrier for oxygen to diffuse through. Oxygen primarily passes through the lens material and into the tear film that bathes the cornea. When the lens is thicker, it is more difficult for oxygen to permeate, reducing the effective amount that can reach the cornea. Additionally, thicker lenses can also create a more significant distance between the lens and the cornea, which can further limit oxygen flow. Adequate oxygen is essential for corneal health; therefore, an increase in lens thickness directly affects the oxygen availability, often resulting in potential discomfort or health issues if the lens is not designed for sufficient oxygen permeability. This explains why the correct concept has been chosen, as it aligns with the understanding of lens thickness and its impact on oxygen transport to the cornea.

As the center thickness of a contact lens increases, the amount of oxygen that reaches the cornea generally decreases. This occurs because a thicker lens creates a greater barrier for oxygen to diffuse through. Oxygen primarily passes through the lens material and into the tear film that bathes the cornea. When the lens is thicker, it is more difficult for oxygen to permeate, reducing the effective amount that can reach the cornea.

Additionally, thicker lenses can also create a more significant distance between the lens and the cornea, which can further limit oxygen flow. Adequate oxygen is essential for corneal health; therefore, an increase in lens thickness directly affects the oxygen availability, often resulting in potential discomfort or health issues if the lens is not designed for sufficient oxygen permeability. This explains why the correct concept has been chosen, as it aligns with the understanding of lens thickness and its impact on oxygen transport to the cornea.