What is the maximum size for scleral contact lenses (CTL)?

What is the maximum size for scleral contact lenses (CTL)?

• A. Up to 20 mm
• B. Up to 25 mm
• C. Up to 30 mm
• D. Up to 18 mm

Answer: (B)

Scleral contact lenses are designed to vault over the cornea and rest on the sclera, providing a unique fit that can accommodate a variety of eye shapes and conditions. The maximum size for scleral contact lenses can vary based on individual eye anatomy, but they typically range in diameter from about 15 mm to 25 mm. A size of up to 25 mm is accepted as the upper limit for scleral contact lenses. This larger size allows for a greater level of comfort and better alignment with the natural curvature of the eye, especially for patients with irregular corneas or those who have had corneal surgeries. The increased diameter also enhances the lens’s ability to hold a pool of tears, which is beneficial for those who need extra moisture in their ocular surface. While smaller sizes might be suitable for specific patients or conditions, sizes above 25 mm are generally not practical due to issues such as movement, stability, and lens handling. Thus, the maximum size for scleral contact lenses suitable for widespread use is considered to be up to 25 mm.

Scleral contact lenses are designed to vault over the cornea and rest on the sclera, providing a unique fit that can accommodate a variety of eye shapes and conditions. The maximum size for scleral contact lenses can vary based on individual eye anatomy, but they typically range in diameter from about 15 mm to 25 mm.

A size of up to 25 mm is accepted as the upper limit for scleral contact lenses. This larger size allows for a greater level of comfort and better alignment with the natural curvature of the eye, especially for patients with irregular corneas or those who have had corneal surgeries. The increased diameter also enhances the lens’s ability to hold a pool of tears, which is beneficial for those who need extra moisture in their ocular surface.

While smaller sizes might be suitable for specific patients or conditions, sizes above 25 mm are generally not practical due to issues such as movement, stability, and lens handling. Thus, the maximum size for scleral contact lenses suitable for widespread use is considered to be up to 25 mm.