This Cressi Prisma package includes the mask and two individual negative corrective lenses, with each eye selected separately. It is a mask-and-lens configuration; a snorkel is only included if it is offered as an optional addition and selected.
What is included
- 1 × Cressi Prisma Mask – With FOG-STOP System
- 1 × Cressi Prisma / Focus corrective lens — first eye
- 1 × Cressi Prisma / Focus corrective lens — second eye
Optional additions
Optional additions are included only when selected. Check your choices and the displayed package total before adding the set to your basket.
Mask features and benefits
Internal fog-management membranes, external heat-exchange structures and micrometric buckle adjustment support a compact mask. Preparation and appropriate lens care still matter.
Technical Specs
| Specification | Details |
|---|---|
| Mask | Cressi Prisma |
| Lens layout | Twin-lens design |
| Fit guide | Check the Cressi skirt and nose chart |
| Corrective lens | Cressi Prisma / Focus |
| Correction type | Full negative correction |
| Powers offered | −1.0 to −8.0 in 0.5-dioptre steps |
| Eye selection | Same lens shape fits either side |
| Standard lens quantity | Two individual lenses; select the appropriate power for each eye |
Understanding this correction
The correction extends across the viewing lens, rather than forming a separate lower gauge-reading segment. These premade spherical lenses do not reproduce cylinder, axis or prism values from a custom spectacle prescription. Ask your optometrist to confirm whether the available powers are appropriate for each eye.
Select both lens entries carefully, including left/right where the lens model uses different sides. A lens name or colour choice does not determine the correct strength. If your needs fall outside the available options, contact our team about a custom prescription mask.
Follow the mask manufacturer’s lens-fitting instructions or ask our team to arrange fitting. Check the completed mask seal and vision before entering the water.
Mask fit and choosing a gift
Face width, shape and nose-pocket comfort matter more than a general age or gender label. Keep hair clear of the skirt and check for an even seal without pressure around the brow or cheeks. Use light strap tension. For a gift, confirm the recipient’s fitting needs before selecting lens powers or fin sizes; our Hallam team can help compare options.
Lens care
Rinse with fresh water, dry in the shade and protect the lenses in a case. Use only cleaners and anti-fog treatments suitable for the installed corrective lenses. Avoid abrasive cleaners and flame treatments.

Shearwater Petrel 3 OC/CC Trimix Dive Computer 

















