Custom Prescription Bifocal lenses

Custom Prescription Bifocal Lenses combine distance and near correction in one dive mask. They are designed for divers who need clearer views of their surroundings and a dedicated reading area for a dive computer, pressure gauge, compass or underwater camera.

How Bifocal Dive Mask Lenses Work

The main lens area carries your distance prescription, while a reading segment provides the near correction. You look through the main area to see ahead and through the lower segment to read equipment close up.

These custom lenses use a D35 bifocal design with a 35 mm-wide reading segment. Optical technicians laminate the lenses into a suitable mask and position the segment for the intended use. Bifocals have a distinct reading section; they are different from progressive lenses.

Why PD and Fitting Height Both Matter

Your PD helps position the lenses horizontally in relation to your pupils. For bifocals, we also need to determine the position of your pupils while you are wearing the chosen mask so the reading section can be set at the appropriate height. Our team will explain the fitting information needed before the lenses are made.

Using an Underwater Camera

Tell us if you take underwater photos or video. A section positioned to read a wrist-mounted computer may be too low for a camera screen, so the reading height needs to be considered during fitting.

Bifocal Lens Material and Prescription Suitability

The D35 lenses use optical crown glass. A 1.80-index option is not available for this bifocal design. Please supply your full distance prescription and reading addition so we can assess the complete correction.

Standard Glass Prescription Range

• Positive prescriptions: up to +7.00 sphere, with up to −4.00 cylinder on a positive prescription.
• Negative prescriptions: up to −10.00 for sphere and cylinder combined.

These are guide limits, not automatic confirmation of suitability. We assess your complete prescription together with the selected mask.

If your distance vision is already clear and you only need help with nearby equipment, ask about custom gauge reader lenses.

Prescription and PD Measurement Required

We require a current spectacle prescription and your pupillary distance (PD) measurement for every custom prescription mask order, including single vision, bifocal and gauge reader lenses. PD is the distance between the centres of your pupils, measured in millimetres. It helps the optical laboratory position your lenses in relation to your eyes.

What to Send Us

• A complete, legible copy of your current spectacle prescription, including the right-eye and left-eye details.
• Your PD measurement from your optometrist or optical dispenser. If it is not on the prescription, please request it before sending your order details.
• Any cylinder, axis, reading addition or prism values shown on your prescription.
• Your mask brand and model, or the mask you would like to purchase.
• Your order number if you have already ordered, plus any upcoming trip date.

Email these details to [email protected]. Send the prescription as supplied by your optometrist; our team will help identify any further information needed.

How to Order Your Custom Prescription Lenses

1. Get your prescription and PD. Both are required so we can arrange lenses for your individual eyesight.
2. Choose a comfortable mask. Select a new mask or contact us about one you already own. The mask must fit your face and be suitable for the lenses.
3. Send us your details. Email your prescription, PD, mask information and order number, if available. Tell us if you use an underwater camera.
4. Confirm the lens and fitting requirements. We check suitability, explain any further measurements and confirm the available option before proceeding.
5. Arrange the custom fitting. Our team will explain how to get your chosen mask to us so the lenses can be made and professionally fitted.

Mask Compatibility and What Is Included

The price covers the custom prescription lens service and the additional express shipping involved in arranging that service. The dive mask itself is sold separately unless you purchase a package.

Many new and existing masks can be fitted, but suitability depends on the mask design, its condition and your prescription. Two-lens masks are often a practical choice. We recommend a high-quality mask that seals comfortably on your face; please contact us before sending an existing mask.

How Long Do Custom Prescription Lenses Take?

Allow approximately 3–4 weeks. Timing can vary with the prescription, lens type, shipping and time of year. Order early for a planned trip and allow time to supply your prescription, PD and any fitting measurements.

Need Help Choosing Your Prescription Mask?

Read our custom prescription dive and snorkelling mask guide, email [email protected] or call our Hallam team on 03 9702 3694.