FAQs

You can:

• Use our Printable PD Measuring Tool
• Ask your optician
• Measure at home with a mirror or a friend’s help

We offer three main types of lenses: Single-Vision, Bifocal, and Reading Segments.

• Single-Vision lenses correct distance vision and fill most of the mask aperture.
• Bifocals include a small segment at the base for reading gauges and camera settings while maintaining clear distance vision.
• Reading Segments correct only near vision and are classed as single-vision for cost purposes.

Varifocal lenses aren’t available because no suitable flat lens blanks exist. However, bifocals account for around half of all orders and provide excellent versatility. For specific applications like photography, we can create larger read areas when no distance correction is required.

You can, but there are several risks:

• The protozoa Acanthamoeba found in fresh and salt water can cause painful corneal infections.
• If your mask floods, contact lenses can shift or adhere to the eye due to osmotic pressure differences.
• Some defogging solutions can be absorbed by soft lenses and cause irritation.
• Hard or gas-permeable lenses can lead to blurred vision after diving due to nitrogen bubbles forming under the lens.

Prescription dive masks remove these risks and give clear, reliable vision.