Shearwater Petrel 3 OC/CC Trimix Dive Computer 
Cressi Prisma Negative Prescription Dive Mask
From: Original price was: $329.85.$308.90Current price is: $308.90. inc. GST
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.
Find your closest preset lens power
Use the distance prescription from your optometrist. Enter one eye or both eyes. Leave the other eye blank if you only need one lens. Results are a guide for preset sphere-only lenses, not a replacement for an eye-care professional's recommendation.
Enter SPH and CYL with a + or − sign, or choose the sign beside each number.
Our custom lenses can be made for your full prescription, including astigmatism or reading correction where suitable.
Explore our custom prescription dive masks →We estimate spherical equivalent as SPH + CYL ÷ 2, then show the closest 0.50 D step from ±1.00 D. AXIS helps describe astigmatism; ADD and prism are not corrected by a distance-only preset sphere lens. A suggested preset may improve distance vision without matching a full prescription. Exact powers and stock differ between masks; check the lens choices above before ordering. If the prescription is for reading only, use the custom lens service or ask your optometrist.
Call us about your lenses: 03 9702 3694- Description
- Additional information
- Shipping
- Returns & Exchanges
- Click & Collect
- Frequently Asked Questions
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.
| Colour | Black / Black / Yellow / Blue lens, Black / Red, Clear / Aquamarine, Clear / White, Clear / Pink, Black / Yellow, Black / Blue, Black / Black |
|---|
Cressi Prisma Mask - With FOG-STOP System
| Colour | Black Mask – UV420 Yellow/Blue Lens, Black / Red, Clear / Aquamarine, Clear / White, Clear / Pink, Black / Yellow, Black / Blue, Black / Black |
|---|
Cressi Prisma Mask Negative Corrective Lens
| Lens | -1, -1.5, -2, -2.5, -3, -3.5, -4, -4.5, -5, -5.5, -6, -6.5, -7, -7.5, -8 |
|---|---|
| Eye | Left, Right |
Cressi Prisma Mask Negative Corrective Lens
| Lens | -1, -1.5, -2, -2.5, -3, -3.5, -4, -4.5, -5, -5.5, -6, -6.5, -7, -7.5, -8 |
|---|---|
| Eye | Left, Right |
Cressi Neo Mask Strap Cover with Ponytail Opening
| Colour | BLUE / WHITE, Pink / White, Black / Yellow, YELLOW / BLACK |
|---|
Cressi Mask Strap Cover 2.0
| Colour | Blue Camo, Black / Turquoise, Black / Yellow, Black / Fluro Pink |
|---|
We dispatch orders five days a week, usually within 1–3 days. Standard mainland Australian shipping is $20. Click & Collect from our Hallam store is free once your order is ready.
- Large or bulky gear: additional freight charges apply on top of standard shipping: large dive bags $30; long freediving fins $15; long spearguns $20. Scuba tank freight is shown at checkout.
- Rural, remote & offshore: rural means anywhere outside metropolitan areas. Carrier availability and additional charges may apply, including for island and territory destinations. Our team will contact you if an extra freight quote is needed.
The available delivery rate for your order is shown at checkout.
We offer a 30-day exchange on most unused products within Australia when they are in saleable condition with their original packaging and accessories. Please contact us with your order number before returning an item. Change-of-mind refunds are not offered; this does not limit your rights for faulty products under Australian Consumer Law.
FREE CLICK & COLLECT
Usually ready same day*
Select local pickup at checkout. We will email you when your order is ready. Please wait for your ready-to-collect confirmation before visiting, then bring your confirmation email and photo ID.
Collect from our Hallam store
Factory 4 / 56–60 Hallam South Rd
Hallam VIC 3803
*For items in stock at our Hallam store during opening hours, subject to order processing. Available-to-order and special-order items take longer. Collection is unavailable while the store is closed.
Can I collect my order from the store?
Yes. Choose free local pickup at checkout and wait for your ready-to-collect email before visiting our Hallam store. Bring your confirmation and photo ID. See Click & Collect details.
How do I choose the right size?
Use the product's size chart where available and compare your measurements with the guide for that brand. Sizing varies between brands and products. If you are unsure, contact our team before ordering and we can help you choose.
How do I check availability?
Select your required options, such as colour and size, to see availability for that variation. If an item is marked “Available to order”, check the estimated dispatch information. Please contact us before ordering if you need gear by a particular date.
When will my order be dispatched?
Orders are usually dispatched within 1–3 days, subject to stock availability. Available-to-order and special-order products may take longer. Delivery time is separate from dispatch time and depends on your location and the carrier. Read our shipping information.
Can I exchange an item if it does not fit?
We offer a 30-day exchange policy on most unused products within Australia, subject to eligibility. Contact us with your order number before returning an item. Read the exchange conditions and next steps.
Can you help me choose the right gear?
Yes. Call 03 9702 3694 during store hours or email [email protected]. Tell us which product you are considering and how you plan to use it.
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