Why are GP lenses controlled by the fitter?

Why are GP lenses controlled by the fitter?

• A. Reduces production costs
• B. Allows for custom lens designs, parameter selection, material selection
• C. Increases shelf life
• D. Eliminates need for fitting

Answer: (B)

Gas permeable lenses work best when they sit on the eye in a way that matches the individual eye tightly. That’s why the fitter must tailor several design elements to each patient. By choosing the base curve and overall diameter, the fitter helps the lens center properly and avoid pressing on the cornea. The edge lift and peripheral curves are adjusted to optimize comfort and tear exchange, which keeps the cornea healthy and the lens stable during blinking. Material choice and lens thickness affect how much oxygen reaches the cornea and how the lens behaves on the eye, influencing both comfort and vision. Because all these factors—design, parameters, and materials—are customized, GP lenses are controlled by the fitter to achieve a precise, safe, and comfortable fit. It’s not about cutting production costs, extending shelf life, or eliminating the need for fitting.

Gas permeable lenses work best when they sit on the eye in a way that matches the individual eye tightly. That’s why the fitter must tailor several design elements to each patient. By choosing the base curve and overall diameter, the fitter helps the lens center properly and avoid pressing on the cornea. The edge lift and peripheral curves are adjusted to optimize comfort and tear exchange, which keeps the cornea healthy and the lens stable during blinking. Material choice and lens thickness affect how much oxygen reaches the cornea and how the lens behaves on the eye, influencing both comfort and vision. Because all these factors—design, parameters, and materials—are customized, GP lenses are controlled by the fitter to achieve a precise, safe, and comfortable fit. It’s not about cutting production costs, extending shelf life, or eliminating the need for fitting.