Need Help Choosing Your Farsighted Lens Strength?

Start with your SPH value, then adjust based on your CYL level

Farsighted (Plus +)

Our farsighted lenses come in whole number steps only: +1.00, +2.00, +3.00, +4.00, +5.00

Your CYL Recommendation
0.00 – 1.75 Round down to nearest whole number for comfort
2.00+ Round to nearest whole number with comfort tie-break:
• If SPH ends in .25 or .50 → round down
• If SPH ends in .75 → round up
Special Case: If your prescription is +0.50 or +0.75, we recommend starting with +1.00 for optimal underwater vision.

Want detailed examples and explanations?

Read Our Complete Lens Selection Guide

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.

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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.