Contact lenses by diameter
The diameter is printed on every blister as DIA. Pick the value of your lens to see all contact lenses available in that diameter – sorted by lens type, with prices from many online shops.
- 14.0 mm 51 products · 9 Daily lenses, 29 Monthly lenses, 7 2-week lenses, 6 other · from £ 13.49
- 14.1 mm 19 products · 15 Daily lenses, 4 Monthly lenses · from £ 18.99
- 14.2 mm 122 products · 48 Daily lenses, 63 Monthly lenses, 5 2-week lenses, 6 other · from £ 10.90
- 14.3 mm 15 products · 8 Daily lenses, 1 Monthly lenses, 2 2-week lenses, 4 other · from £ 22.99
- 14.4 mm 35 products · 4 Daily lenses, 30 Monthly lenses, 1 other · from £ 18.89
- 14.5 mm 38 products · 9 Daily lenses, 23 Monthly lenses, 3 2-week lenses, 3 other · from £ 16.90
What the diameter means
The diameter (DIA) is the size of the contact lens from edge to edge, given in millimetres. Soft lenses are larger than the cornea and usually measure between 13.8 and 14.5 mm so that they cover the cornea completely and are stabilised by the eyelids. Rigid gas permeable lenses are much smaller (about 9 to 10.5 mm) and float on the tear film of the cornea.
Where to find the value
On the blister and on the box you will find the diameter as DIA, next to the base curve as BC and the power as PWR or D. The same details are on the lens prescription you received at your fitting.
Diameter and base curve belong together
Both values describe the fit: the base curve sets the curvature of the back surface, the diameter the size of the lens. A flatter base curve sits looser at the same diameter, a larger diameter sits tighter at the same base curve. That is why the values are always chosen as a pair during fitting, and why the value pages show the base curve of every lens.
When a change belongs to your optician
The same diameter does not automatically make a lens suitable. Material, edge design and base curve all play a part. If you want to try a different product, have the fit of the new lens checked – contact lenses are medical devices.