What Size MaskOptix Glasses Fit My Scuba Mask or Helmet?
For years, divers who wear glasses had to struggle with blurry vision, wrestle with inserts, or buy a special prescription mask that only worked for one setup. MaskOptix changes that by turning your prescription into true dive‑wear eyeglasses that sit comfortably inside your mask, so you keep the mask or full‑face system you love and finally see the underwater world the way it was meant to be seen.
Why divers love MaskOptix
MaskOptix was designed from the ground up specifically for diving not just “regular glasses that happen to fit under a mask.”
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Real prescription, real clarity: Lenses are made to your eyeglass prescription, so what you see underwater feels natural and familiar.
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Full‑field vision: Instead of peering through a tiny insert “sweet spot,” you get clear vision across your whole view, making it easier to see your buddy, read gauges, and enjoy the scenery.
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No glued inserts or modified masks: You keep your existing mask; MaskOptix frames go on your face like normal glasses and then your mask or full‑face system goes over them.
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Above and below the surface: Many divers use their MaskOptix glasses topside as everyday eyewear and then go straight into the water without changing setups.
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Options for real‑world diving: You can choose lens options to handle bright surface conditions and variable light on the dive.
In short, MaskOptix is built for divers who want the comfort of their everyday glasses and the performance of dedicated dive gear in one solution.
Works with Virtually Any Dive Mask
One of the biggest advantages of MaskOptix is that you are not locked into a single mask model or brand. Buy Maskoptix Prescription Eyeglasses Here
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Slim, low‑profile frame: The frame is designed to sit close to your face, so it fits comfortably beneath most single‑window and twin‑lens masks.
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Doesn’t interfere with your seal: Because the frame is narrow and ergonomic, it stays inside the mask volume and away from the skirt, so you can still get a solid, watertight seal when the mask is properly fitted.
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Easy to swap masks: If you move from one traditional mask to another, your prescription stays the same; you just wear the same glasses under different gear.
There will always be a few outliers—extremely low‑volume freediving masks or unusually small faceplates can be tight for any eyeglass solution—but the Fit Guide shows you how to quickly check compatibility at home before you dive. MaskOptix works with many full‑face masks and helmets.
MaskOptix is also an excellent option for many full‑face masks and diving helmets where built‑in prescription options are limited or expensive.
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More room to work with: Full‑face masks and helmets usually have greater internal volume, which often makes it easier to accommodate a low‑profile eyeglass frame.
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One pair, multiple configurations: If you dive both a standard mask for recreational dives and a full‑face system for work or cold water, you can often use the same MaskOptix glasses in both setups.
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No tools or special hardware: Because the glasses sit on your face, you don’t need special brackets or clips inside the full‑face mask—just a proper fit and enough clearance around your forehead and nose.
As with any gear, there are a few models that may be too tight or have internal components close to the face. That’s where the Fit Guide becomes especially important.
What you’re measuring
You’re measuring the inside width of the mask viewing area, not the outside frame. This tells you which MaskOptix frame size will comfortably fit inside without touching the skirt or pushing into the mask glass.
Step‑by‑step measurement: MaskOptix Fit Guide
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Take the mask lens‑side down
Lay your mask on a flat surface with the glass facing down and the skirt pointing up so you can see the inner opening clearly. -
Identify the inner opening
Look at the soft silicone skirt where it meets the glass. You want the distance from the inner left side to the inner right side where your eyes look through, not the very outer edge of the silicone. -
Use a ruler or tape
Place a straight ruler or tape measure across the narrowest part of that inner opening, left to right. Keep it level and as straight as possible. -
Record your width
Note the measurement in inches and/or millimeters. Most adult masks fall somewhere around 4–5 inches (about 100–125 mm) across the inner opening. -
Enter it in the Fit Guide: Here
Go to the page, enter that width, then click on the suggested frame names. The guide matches your mask opening to the frame sizes designed to fit inside comfortably. Then pick your favorite style
Buy Maskoptix Prescription Eyeglasses Here
Need help? Contact Joe Johnson
MaskOptix Divers Support Specialist, R&D
PADI MSDT
office: 585.978.8590