Rx Carbon & RX Mirage Mask Sizing Guideline Chart

How to measure your face for a prescription mask (width & height)
Rx Carbon & Rx Mirage
Size Category: Large — comfortably fits most medium to larger face shapes.

How to measure

  • 1Width: straight line from outer eye corner to outer eye corner (don’t wrap).
  • 2Height: from just under your nose to just above your eyebrow line.
Mask Size Ranges
Min (in) Max (in)
Width 4 ″ 5½ ″
Height 3½ ″ 4 ″

Options: Nearsighted lenses · Frames: Carbon-fiber (Rx Carbon) or Camouflage (Rx Mirage).

Rx Lens Strength + Face Fit

Find Your Prescription Mask Quiz

Built specifically for prescription snorkel and dive masks, this quiz helps match your lens strength, face fit, and intended use in one simple flow.

Answer up to 6 quick questions in about 2 minutes.

Start the quiz →

Have your prescription nearby if you know your numbers. If not, no problem, we can still guide you.

Lens strength Face fit Snorkel or dive
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Your prescription image is only used to read your values. It is never stored.

All our masks

Use Our Exclusive Underwater Lens Calculator Tool

Underwater, light bends differently and can make your usual prescription feel too strong. We lower it slightly to prevent overmagnification. Step 1: Enter your prescription to find your recommended underwater lens strength

[−] minus for Myopia (nearsighted), [+] plus for Hyperopia (farsighted).
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Right CYL Check your CYL value and its + or − sign. Select 0.00 if you have no astigmatism.
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Left CYL
Your Recommended Underwater Lens Strength
Right (OD)
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Left (OS)
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This is your recommended starting strength. If unsure, email us your prescription and we will confirm.