TUSA Freedom Ceos Positive Prescription Dive Mask – Full Diopter
Experience clear, comfortable vision across the entire lens with the TUSA Freedom Ceos Positive Prescription Dive Mask – Full Diopter. Designed for farsighted divers and snorkellers, this prescription dive mask combines the popular TUSA Freedom Ceos mask with high-quality positive corrective optical-glass lenses.
Unlike bifocal reading lenses that provide correction only through a small lower section, these full positive prescription lenses correct the entire viewing area. This provides clearer overall vision when exploring reefs, observing marine life and viewing your underwater surroundings.
Choose an individual prescription strength for each eye from +1.0 to +4.5 diopters, available in 0.5 increments. This makes the mask ideal for divers whose left and right eyes require different levels of positive spherical correction.
Mask fit and specifications
These fit and construction details describe the base mask. The selected corrective lenses determine the fitted lens prescription and optical properties.
| Model number | M-212 |
|---|---|
| Face-fit profile | Medium (TUSA 2026 skirt-fit guide) |
| Frame construction | Framed |
| Skirt design | Freedom Technology; rounded-edge skirt |
| Strap design | Adjustable silicone 3D anatomical split strap; skirt-mounted quick-adjust buckles |
| Buckle adjustment | Skirt-mounted quick-adjust buckles |
| Internal volume | 180 cc |
| Frame dimensions | 72 × 157 mm |
| Fitting dimensions | 113 × 130 mm |
| Listed mask weight | 184 g |
The fit classification follows TUSA’s 2026 skirt-fit guide. Check the seal, brow clearance and nose comfort on your own face; the fit label is a starting point.
Why Choose a Full-Diopter Prescription Dive Mask?
Full-diopter lenses provide positive correction throughout the entire lens rather than only through a reading segment. This gives farsighted divers a consistently clear view across the mask’s complete field of vision.
The result is greater visual comfort, improved underwater awareness and a more enjoyable scuba diving or snorkelling experience.
TUSA Freedom Ceos Prescription Mask Features
- Complete TUSA Freedom Ceos prescription dive mask
- Includes positive corrective lenses for both eyes
- Full-lens positive correction across the entire viewing area
- Select a different diopter strength for the left and right eye
- Available from +1.0 to +4.5 diopters
- Supplied in 0.5-diopter increments
- High-quality optical-glass corrective lenses
- Excellent clarity for scuba diving and snorkelling
- Low-volume, dual-lens mask design
- Wide field of view with reduced internal volume
- Soft silicone skirt for a comfortable, secure seal
- Easy-adjust buckles for quick strap adjustment
- Suitable for recreational scuba diving and snorkelling
TUSA Positive Corrective Optical Lenses
The included TUSA Positive Corrective Prescription Lenses are premade from high-quality optical glass. They help farsighted divers enjoy sharper vision both above and below the surface.
Because separate left and right lenses are available, you can configure the mask according to the positive spherical correction required for each eye. This is particularly beneficial when your prescription is not the same in both eyes.
Available Positive Diopters
Choose the required strength for each eye:
+1.0, +1.5, +2.0, +2.5, +3.0, +3.5, +4.0 or +4.5
Selecting Your Corrective Lenses
These lenses provide positive spherical correction only. The selected diopter corresponds to the SPH or Sphere value on your optical prescription.
They do not correct:
- Cylinder or CYL
- Axis
- Astigmatism
- Prism measurements
Select the appropriate diopter strength separately for your left and right eyes. If you are uncertain which strengths to order, ask your optometrist to recommend the most suitable positive spherical correction for each eye before purchasing.
What’s Included?
- One TUSA Freedom Ceos scuba diving mask
- One selected left positive corrective lens
- One selected right positive corrective lens
- Professional lens installation
Please note: This product uses premade positive spherical lenses and is not a custom optometrist-made prescription mask. Lens strengths are selected separately for each eye.

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