What is the difference between nearsighted and farsighted lenses?

Nearsighted lenses have a negative SPH value and correct distance vision. Farsighted lenses have a positive SPH value and correct close-up vision.

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

The SPH value is usually in the first column of your prescription. A negative number indicates nearsightedness, while a positive number indicates farsightedness.

How Should I Adjust My Prescription for Clear Vision Underwater?

Select a lens strength 0.50 to 0.75 diopters weaker than your regular prescription to compensate for underwater magnification.

Can I choose a lens strength that isn’t listed in the dropdown?

If your exact strength isn’t available, pick a lens 0.50 to 0.75 diopters weaker than your prescription to maintain clear vision underwater.

Can I choose different lens strengths for each eye?

Yes, you can select different strengths for each eye if they are available in the dropdown.

How do I upload my prescription during checkout?

You don't need to upload it. Contact us via chat or email if you require specific strengths or assistance.

What happens if I accidentally choose the wrong lens strength?

Contact customer support immediately. We may be able to correct the order depending on its processing stage.

Are your lenses safe for both snorkeling and scuba diving?

Yes, all lenses are certified HD Tempered glass and safe for snorkeling and scuba diving up to 100ft.

How long does it take to receive lenses, and can I track my order?

Orders usually take 7-14 days to process. A tracking number will be provided via email upon shipment.

What is your return or exchange policy for prescription lenses?

You have 30 days from delivery to return your mask. For full details, visit our returns policy on the Oceans Optics website.

Customers rate us 4.9/5 based on 872 reviews.

Mask Size Guide Helper

How to Check if a Mask Will Fit Online

At Oceans Optics, we understand that a proper mask fit is essential for a comfortable and safe dive. Our masks are designed to fit a variety of face shapes, and we’ve made it easy for you to find the perfect size.

What Tools Do I Need?

Hard Ruler or Measuring Tape
Mirror
Pen and Paper

How Do I Measure My Face?

Measure Face Width:
Use a hard ruler to measure from the outer corner of your eye on one side to the outer corner of your other eye.
Measure Face Height:
Measure from just below your nose up to just above your eyebrow line.
Compare Your Measurements:
Match your width and height measurements with our mask specifications below. Aim to be between Min and Max, and as close to Optimal as possible.

Let customers speak for us

from 872 reviews

Perfect

The mask is perfect, fits well and works great!

Robin Bolle

Rx Obsidian Nearsighted Prescription Snorkel & Dive Mask (Medium)

05/06/2025

I’ll finally be able to see!

We ordered three and we all can see great. Good quality. Only complaint one was supposed to have GoPro attachment and didn’t but did not have time to return before our trip. Other wise very happy.

Joanne Vicich

Rx Obsidian Nearsighted Prescription Snorkel & Dive Mask (Medium)

05/06/2025

Great!

They work great!

Brittany J.

Rx Obsidian Nearsighted Prescription Snorkel & Dive Mask (Medium)

05/04/2025

Fantastic!

The last time I went snorkeling (more than 10 years ago) I wore contacts. At age 65, glasses only. I thought I was done snorkeling, until I found these! They worked perfectly! I could see the fish. And at around 80 bucks for the mask and a breather tube, it's a bargain. They charge like $25 to rent them at the beaches when you go on a cruise (and it is gross using something that was in someone else's mouth!) I highly recommend these if you are near-sighted and want to snorkel.

GoBucksJoe

Rx Obsidian Nearsighted Prescription Snorkel & Dive Mask (Medium)

03/03/2025

Ecellent mask, i can finally see! Wow, im so happy i found this site!

Jewell Schinner

Rx Action Prescription Dive Mask w/Cam Mount

02/26/2025

Great fit, great view.

Received my prescription mask. It fits great and I am looking forward to actually being able to see the world underwater for the first time.

Marian Brown

Rx Obsidian Nearsighted Prescription Snorkel & Dive Mask (Medium)

02/25/2025

Great mask

Had no idea that I could order a prescription mask for my husband! Ended up being the best gift ever for our trip to Cozumel. Amazing mask and spot on!

Suezq

Rx Carbon: Nearsighted Mask for Scuba Diving - Large

02/18/2025

I could see!!!

I have been unable to wear contacts for the past 5+ years , so ordered this mask with the 7 (highest) lens. Took a snorkel trip in Belize. The guide pointed out sting rays buried in the white sandy bottom - sea urchins tucked in reefs - I saw all of it - better than contacts with a regular mask. Best pre vacation purchase ever!

Meg S

Rx Obsidian Nearsighted Prescription Snorkel & Dive Mask (Medium)

02/18/2025

I can snorkel!!!

It has been more than a decade since I went snorkeling. At age 65 I no longer wear contacts lenses. Finding prescription goggles (at a very reasonable price) was a blessing! Without correction, everything would be a blur. But I was able to see the fish and the rest quite clearly!

Plus it was comfortable. If you need prescription lenses for distance, these are worth it.

Additionally, they came pretty quickly.

GoBucksJoe

Rx Obsidian Nearsighted Prescription Snorkel & Dive Mask (Medium)

02/17/2025

Great mask and can see without glasses!!!

Great quality mask!!!

Steve Goode

Rx Carbon: Nearsighted Mask for Scuba Diving - Large

02/16/2025

Great fit, and an amazing buy!!

Even though I haven’t tried the in the water yet I am super happy with my purchase!!