Which diameter range is typical for soft contact lenses?

Which diameter range is typical for soft contact lenses?

• A. 13.8 to 15.0 mm
• B. 6.0 to 18.0 mm
• C. 11.0 to 12.5 mm
• D. 14.5 to 15.5 mm

Answer: (A)

Soft contact lenses are sized by diameter to cover the cornea comfortably and stay centered with blinking. For most eyes, the standard soft lens diameter falls in the roughly 13.8 to 15.0 mm range. This size matches the average corneal diameter and provides good coverage without causing edge lift or lid interference, while still allowing typical lens movement and tear film distribution. Diameters much smaller (like 11.0–12.5 mm) wouldn’t fully cover the cornea, and extremely small or very large options outside this range are not common for standard soft lenses. A narrower range that starts higher, such as 14.5–15.5 mm, would miss many standard options and isn’t as representative of what most soft lenses use. So, 13.8 to 15.0 mm captures the typical sizing used for everyday soft lenses.

Soft contact lenses are sized by diameter to cover the cornea comfortably and stay centered with blinking. For most eyes, the standard soft lens diameter falls in the roughly 13.8 to 15.0 mm range. This size matches the average corneal diameter and provides good coverage without causing edge lift or lid interference, while still allowing typical lens movement and tear film distribution. Diameters much smaller (like 11.0–12.5 mm) wouldn’t fully cover the cornea, and extremely small or very large options outside this range are not common for standard soft lenses. A narrower range that starts higher, such as 14.5–15.5 mm, would miss many standard options and isn’t as representative of what most soft lenses use. So, 13.8 to 15.0 mm captures the typical sizing used for everyday soft lenses.