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Nearsighted (Myopia) lenses: Negative SPH values (example: -2.50) to help you see clearly at distance.
Farsighted (Hyperopia) lenses: Positive SPH values (example: +2.50) to help with close-up vision.
Look for the column labelled SPH or Sphere. It can also be labelled Power or PWR. A minus sign (-) is nearsighted. A plus sign (+) is farsighted.
Underwater adjustment: For most people, choosing a lens that is 0.50 diopters weaker (towards zero) than your normal SPH gives the best comfort and clarity underwater.
Why: Water creates natural magnification, and mask lenses sit further from your eyes than glasses. Reducing by 0.50 helps keep vision feeling natural and comfortable underwater.
Examples: If your SPH is -2.25, choose -2.00. If your SPH is -2.75, choose -2.50.
Our lenses are available in 0.50 increments, so choose the closest available option.
Our standard prescription options are based on SPH. If you have astigmatism (CYL), use the same rule whether your cylinder is minus (-) or plus (+). What matters is the size of the CYL value, not the sign.
If your CYL is 1.00 or less (for example -0.50, -1.00, +0.50, or +1.00), you can usually follow the normal underwater adjustment and choose 0.50 weaker than your SPH (towards zero), then pick the closest available 0.50 step.
If your CYL is stronger than 1.00 (for example -1.25, -1.75, +1.25, or +2.00), we recommend no reduction or a minimal 0.25 reduction (if available), then choosing the closest option in our 0.50 steps.
If you are unsure, upload your prescription and we will quickly check your selection for you.
The dropdown shows all strengths available for that specific mask. If your exact number is not listed, choose the closest available option using the guidance above.
If you want us to confirm the best match, upload your prescription on the product page or email us at info@oceansoptics.com.
Yes. You can select different strengths for left and right eye. You can mix and match any combination available in the dropdown menu.
On the product page you can optionally upload your prescription so we can check your selection before we build it. You can also leave a note in the cart, or email us at info@oceansoptics.com.
A simple method is the toothpaste trick. Rub a small amount of toothpaste on the inside of each lens using circular motions for a few minutes, then rinse thoroughly. Do this before your first use (and repeat if needed).
Before each session, you can also use a tiny amount of baby shampoo or dish soap mixed with water. Rub a thin film on the inside of the lens, then lightly rinse so a fine layer remains.
Yes. Here is our Mask 101 guide: Open Mask 101 (PDF).
Message us as soon as possible. If the order has not entered the build or shipping stage yet, we can usually update the lens selection.
Yes. Our lenses are HD tempered glass and are suitable for snorkeling and scuba diving up to 100 ft (30 m).
Most orders arrive in 5 to 10 days, but we recommend allowing up to 14 days to be safe. You will receive a tracking number by email once your order ships.
Your satisfaction, guaranteed.
You have 30 days from delivery to request a return, as long as the item is unworn, unused, with tags, and in original packaging. For full details, visit our Return Policy.
