Known as circle lenses, these are colored contacts — sometimes in weird shades like violet and pink — that make the eyes appear larger because they cover not just the iris, as normal lenses do, but also part of the whites.

The diameter of regular contact lenses that are sold in the United States are on average 14mm–16mm. Similar to the diameter of regular contact lenses, circle lenses have no more than 15mm diameter since larger sizes would be harmful to the eyes at daily wear.

Contact lenses are not one-size-fits-all. Having the right fit is essential for clear vision and long-term comfort and satisfaction with your lenses. The diameter and base curve are important factors in determining what the optimum fit is for you.

Prescription contact lenses do not make the pupil of the eye appear larger. However, there is a growing trend of women wearing circle contact lenses, which make the eyes appear large and childlike in appearance.

All contact lenses have a measurement called the diameter. This measurement is in millimeters and is the size of the lens. The August, 2005 issue of “Contact Lens Spectrum” notes that the average contact lens diameter is 14.0mm.

Conclusion. The size of a human adult eye is approximately 24.2 mm (transverse) × 23.7 mm (sagittal) × 22.0-24.8 mm (axial) with no significant difference between sexes and age groups. In the transverse diameter, the eyeball size may vary from 21 mm to 27 mm.

The sagittal vertical (height) of a human adult eye is approximately 23.7 mm (0.93 in), the transverse horizontal diameter (width) is 24.2 mm (0.95 in) and the axial anteroposterior size (depth) averages 22.0–24.8 mm (0.87–0.98 in) with no significant difference between sexes and age groups.

Eye Size: the width of the frame around the lens. Bridge Width: the width of the frame across your nose. Temple Length: the length of the arm of the glasses from the front of the frame to behind your ear.