What is the size range for semi-scleral contact lenses (CTL)?

What is the size range for semi-scleral contact lenses (CTL)?

• A. 6-10 mm
• B. 12-15 mm
• C. 16-22 mm
• D. 10-14 mm

Answer: (B)

Semi-scleral contact lenses occupy a size range generally larger than traditional contact lenses, designed to rest partially on the sclera and provide both comfort and stability. The size range of 12-15 mm is consistent with the characteristics of semi-scleral lenses, as they typically have a larger diameter than those used in standard fit lenses. This particular sizing allows for a greater area of the cornea to be covered while providing peripheral support on the sclera, which is crucial for patients who may have irregular corneas or need enhanced comfort and vision correction. By extending their diameter, semi-scleral lenses minimize movement and improve stability on the eye, which is particularly beneficial for patients with specific ocular conditions. The choice of 12-15 mm balances the advantages of larger lens designs with the necessary comfort for wearing them for extended periods.

Semi-scleral contact lenses occupy a size range generally larger than traditional contact lenses, designed to rest partially on the sclera and provide both comfort and stability. The size range of 12-15 mm is consistent with the characteristics of semi-scleral lenses, as they typically have a larger diameter than those used in standard fit lenses. This particular sizing allows for a greater area of the cornea to be covered while providing peripheral support on the sclera, which is crucial for patients who may have irregular corneas or need enhanced comfort and vision correction.

By extending their diameter, semi-scleral lenses minimize movement and improve stability on the eye, which is particularly beneficial for patients with specific ocular conditions. The choice of 12-15 mm balances the advantages of larger lens designs with the necessary comfort for wearing them for extended periods.