What is the difference between nearsighted and farsighted lenses?

Nearsighted (myopia) lenses use negative SPH values to correct distance vision. Farsighted (hyperopia) lenses use positive SPH values to help with close-up vision.

How do I find the sphere (SPH) value on my prescription?

Look for SPH or Sphere. It can also be labelled Power or PWR. A minus sign (-) is nearsighted and a plus sign (+) is farsighted.

How should I adjust my prescription for clear vision underwater?

For most people, choose 0.50 diopters weaker (towards zero) than your normal SPH, then select the closest available 0.50 step.

I have astigmatism (CYL). What should I choose?

Use your SPH for each eye. The + or minus sign on your CYL matters. Nearsighted: CYL 0.00 to 0.75 go 0.50 weaker. CYL 1.00 to 1.75 minus CYL stay close to SPH up to 0.50 either direction. CYL 1.00 to 1.75 plus CYL stay at SPH or 0.50 weaker. CYL 2.00+ minus CYL stay at SPH. CYL 2.00+ plus CYL stay at SPH. CYL 3.25+ nudges toward SE. Farsighted lenses come in whole steps +1 to +5. Special case: SPH -0.50 or -0.75 with CYL 2.50+ start at -1.00. SPH +0.50 or +0.75 start at +1.00.

I can't find my lens strength in the dropdown. What should I do?

Choose the closest available option. Upload your prescription or email info@oceansoptics.com if you want us to confirm the best match.

Can I choose different lens strengths for each eye?

Yes. You can select different strengths for left and right eye and mix and match any combination available in the dropdown.

How do I upload my prescription during checkout?

On the product page you can optionally upload your prescription. You can also leave a note in the cart or email info@oceansoptics.com.

How do I stop my mask from fogging?

Try the toothpaste trick: rub a small amount on the inside of each lens in circular motions, then rinse. Before each session use a tiny amount of baby shampoo or dish soap, rub a thin film on the lens, then lightly rinse.

Do you have a guide to help me use my mask properly?

Yes. Mask 101 guide: https://cdn.shopify.com/s/files/1/0798/8055/2781/files/Mask_101.pdf?v=1728895468

What happens if I accidentally choose the wrong lens strength?

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.

Are your lenses safe for both snorkeling and scuba diving?

Yes. Lenses are HD tempered glass and suitable for snorkeling and scuba diving up to 100 ft (30 m).

How long does delivery take, and can I track my order?

Most orders arrive in 5 to 10 days, but allow up to 14 days to be safe. Tracking is provided by email once shipped.

What is your return or exchange policy for prescription masks?

You have 30 days from delivery to request a return as long as the item is unworn, unused, with tags, and in original packaging.

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Rx Rover Prescription Snorkel/Dive Mask Small

Name: Rx Rover Prescription Snorkel/Dive Mask Small
Brand: Oceans Optics
SKU: 14:366#-1.5-All Black
Price: 70.00 USD
Availability: InStock

Quantity

$70.00 USD

SALE Sold out

Shipped with Care. No Hidden Fees. Just Clear Vision Ahead.

OCTOBER SALE - NO TRICKS, FREE TREAT! 🎃 Buy a Mask + Snorkel + Case and get a FREE Dry Bag. 🎃 Add the Dry Bag to cart to claim yours! Use code HALLOWTREAT26

Choose Free Dry Bag

Mask Description

Discover the RX Rover Dive Mask, expertly crafted for teens and adults with smaller face sizes. Its compact, low-volume design minimizes drag making it an ideal choice for snorkeling and diving.

The ultra-soft hypoallergenic silicone skirt guarantees a secure, irritation-free fit, even during extended underwater adventures.

Durable tempered glass lenses deliver crystal-clear vision. Quick-release buckles allow for easy adjustments on the go.

Sleek, durable, and designed for lasting performance—the RX Rover is your trusted companion for underwater exploration!

Mask Size Chart

How to measure your face for a prescription mask (width & height)

Rx Rover

Size Category: Small — great for narrower faces and lower volumes.

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	3 ″	4½ ″
Height	2¾ ″	3½ ″

Options: Nearsighted (−1.50 to −6.00) · Skirts: Black / White · Frames: Black, Blue, Yellow, Red, Pink.

Prescription Lens Info

This mask features Nearsighted (SPH) lenses in Negative diopters (e.g., -1.50, -2.00 & -6.00).

Tempered glass lenses for strength, safety, and clear underwater vision.

Available in -1.50, -2.00, -3.00, -3.50, -4.00, -4.50, -5.00, -5.50, -6.00.

The close proximity of this low-volume frame prevents us from installing stronger lenses

Free Shipping All Orders Over $70

All orders are carefully packed — Quality guaranteed! $5.99 for orders below $70, USPS Tracked [5-14 days]

30 Day Free Returns

Take advantage of our 30 days from delivery FREE return policy — shop with confidence. Eligible items only, see our full return policy for more info

More than JUST a Mask

At Oceans Optics, we believe the right gear is only part of the experience. Our free Snorkeling Learning Hub, built by professional instructors, gives you practical guidance on gear and vision, safety and conditions, in-water skills, underwater science, and marine life.

Learn at your own pace, test your knowledge, and build confidence before your next adventure.

View full details

Underwater Lens Calculator

Enter or upload your prescription to find your recommended underwater lens strength for this mask.

Upload prescription or enter it below

Sphere Right (OD)

CYL:

AXIS:

Sphere Left (OS)

CYL:

AXIS:

Prescription name (optional, e.g. who it is for)

Snorkeler wearing a twin-lens mask over a coral reef

MORE THAN JUST A MASK

Your Free Snorkeling Learning Hub

MORE THAN JUST A MASK

Your Free Snorkeling Learning Hub

At Oceans Optics, we believe the right gear is only part of the experience. Knowing how to use it, what to look out for, and how to feel confident in the water matters just as much.

Built by Professional Instructors

Explore lessons on:

Gear & Vision

Safety & Conditions

In-Water Skills

Underwater Science & Your Body

Marine Life & Conservation

Free to explore. Easy to follow. Built to help you snorkel with more confidence.

EXPLORE THE LEARNING HUB

Shop Our New I Can Sea Tees!

1 8

View All

How to account for Cylinder?

Find your CYL value below, then check the sign, plus or minus, for your recommendation

Nearsighted, Minus −

Your CYL	Recommendation
0.00 to 0.75	Go 0.50 weaker than your SPH, closer to zero Example: SPH −3.00, choose −2.50
1.00 to 1.75	If your CYL shows a minus sign: stay close to your SPH. You can go up to 0.50 stronger, further from zero, or up to 0.50 weaker, closer to zero Example: SPH −3.00, anywhere from −2.50 to −3.50 If your CYL shows a plus sign: stay close to your SPH. You can go up to 0.50 weaker, closer to zero, or stay at SPH Example: SPH −3.00, choose −3.00 or −2.50
2.00+	If your CYL shows a minus sign: stay exactly at your SPH. Only go 0.50 stronger, further from zero, if you specifically want sharper detail and are prepared for more eye strain on longer sessions Example: SPH −3.00, choose −3.00, or −3.50 for crispness only If your CYL shows a plus sign: stay exactly at your SPH. Do not go weaker Example: SPH −3.00, choose −3.00

Special Case: If your SPH is −0.50 or −0.75 and your CYL is 2.50 or higher, we recommend starting at −1.00. Going weaker than this rarely gives useful correction underwater.

Not sure if your CYL is plus or minus? Check your prescription slip. It will show either a minus or plus sign next to the CYL value. If there is no sign shown, ask your optometrist which form your prescription is written in.

Which mask fits your prescription?

Rx Rover

Available from −1.50 to −6.00

Best for smaller to medium faces

View Rx Rover

Rx Lumix

Available from −1.50 to −6.00

Aluminium frame, small to medium faces

View Rx Lumix

Rx Titan

Available from −1.50 to −7.00

Roomier fit for medium to large faces

View Rx Titan

Rx Obsidian

Available from −1.00 to −9.00

Full range, suits most face shapes

View Rx Obsidian

Rx Rover Prescription Snorkel/Dive Mask Small

Mask Description

Mask Size Chart

How to measure

Free Shipping All Orders Over $70

30 Day Free Returns

More than JUST a Mask

Underwater Lens Calculator

Your Free Snorkeling Learning Hub

Your Free Snorkeling Learning Hub

Customer Reviews

How to account for Cylinder?

Which mask fits your prescription?

Frequently Asked Questions