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Prescription Lens Masks


We have been told by our suppliers that we sell more corrective lens dive mask than the whole of the rest of the Australian dive industry combined. It's because of the detailed information on this web page, plus our excellent customer service and everyday low prices. Please read the following information carefully. Then join the thousands of divers and snorkellers who are seeing clearly underwater using a corrective lens mask from The Scuba Doctor.

Prescription vs Corrective Lens Masks

If you wear prescription glasses, diving and snorkelling masks fitted with lenses with your exact prescription can be obtained. But it's very expensive and time-consuming. Most divers and snorkellers don't require this expensive solution and their needs can be solved with less expensive and quick to obtain corrective lens mask solutions. The important thing here is to make sure that the variety of your needs are taken into consideration and the right solution is chosen.

Negative Correction Lens — If you are a snorkeller you probably just need to see objects in the distance, therefore a distance only correction lens can be used with selected masks. That's the case for many divers as well. The solution is what we call a negative corrective lens mask — a negative correction to the whole lens, for short/near-sighted people with myopia.

Positive Correction Lens — For some scuba divers and snorkelers it's the reverse and and they need positive correction lenses for near vision issues. The solution is what we call a positive corrective lens mask — a positive correction to the whole lens, for long/far-sighted people with hypermetropia.

Bifocal Correction Lens — Some scuba divers just need a bit of help reading their gauges, dive computers, or camera controls. The solution is what we call a 'bifocal', or 'gauge reading', corrective lens mask — clear or planar on top and a lower pane with positive correction for reading.

Sometimes snorkellers and scuba divers have eye shapes that require lens shapes not available with corrective lenses. They need an exact, full prescription lens mask solution, and we can't provide it.

Also, some divers may need both distance correction to see the underwater life, and near correction to read gauges and dive computers. Therefore, depending on your prescription, true bifocal, or truncated, full prescription lenses may be required — distance correction on top and a lower pane with positive correction for reading. This is what we call a full bifocal prescription lens mask solution, and we can't provide it.

Your optometrist is the best person to advise you as to which of the above solutions are right for you. Please show them this web page so that they can understand what we can and can't do. Then they can give you the right and left eye correction values we need to provide your underwater vision solution.

Diving/Snorkelling Mask Corrective Lenses

The Scuba Doctor is able to provide the dive and snorkelling masks listed here already fitted with pre-made corrective lenses that correct close to your prescription, not exact. This is a good solution for most scuba divers and snorkellers with low astigmatism.

Dive mask with corrective lenses
Corrective lens mask: the mask, plus two separate correction lenses.
Supplied with the corrective lenses fitted, plus the original normal lenses.

We can offer dive masks in a range of correction strengths to suit most people. We offer positive and negative corrections and bifocals. Bifocals are great for people who are long sighted and just struggle to view their gauges. The lenses we supply are not the stick on type, they are complete replacements for the current lenses. We can therefore only supply these on a select few masks.

Some of the masks with optional vision correcting lenses can be obtained with either a '-' (minus/negative) dioptre (e.g. -1.5 to -9.0), or a '+' (plus/positive) dioptre (e.g. +1.0 to +4.5), typically in 0.5 increments.

 

Some divers require negative distance vision correction, that is, the diver has 'near-sightedness' and the Rx Sphere value is a '-' dioptre.

Other divers require a positive correction, that is, the diver has 'far-sightedness' and the Rx Sphere value is a '+' dioptre.

To order, you can consult your eyeglass, or contact, prescription for the proper amount of spherical power correction. A spectacle prescription is usually written in the following form:

  sphere   cylinder   axis
OD / R -3.00 / -0.50 x 180
OS / L -3.50 / -1.00 x 180

In order to calculate the power you need to take into account the two aspects of your prescription.

  • The sphere (or sph) is the main part of your prescription and will be '–' for short-sightedness (myopia) and '+' for long-sightedness (hypermetropia).
  • The cylinder (or cyl) is the secondary part of your prescription and refers to the amount of astigmatism you have.

We need the dioptre (diopter) value for each eye. When reading your prescription, 'OS' means your left eye, and 'OD' means your right eye.

You could base the power you order primarily on the amount of short or long-sightedness you have. If you also have a moderate degree of astigmatism (up to 2.00), you could also incorporate up to half of this to choose the most appropriate power. If the result is a quarter dioptre prescription, then you should typically increase to the next higher/stronger dioptre. For example, if the Rx is -1.75, then increase to -2.0 dioptre. If the Rx is +1.75, then increase to +2.0 dioptre. If one eye needs no correction, then order a 'Normal' or 'Plano' lens for that side.

If this all sounds very complicated, it's because it is! You will find websites that let you enter your script values to calculate the two values we need. We know the formula they use, but our optometrist friends tell us using this method would often lead to disappointed customers. It's just not that simple.

The decision about the values you need is best done by your optometrist as they know best what's going on with your eyes, and sometimes those other values in your script come into play.

Once you know the dioptre values you need, you can then select a mask for which the range or dioptre values available matches your requirements.

Bifocal or 'Gauge Reader' Corrective Lenses

Gauges gone fuzzy?Finding the numerals on your gauge too small, especially in the dark? Finding your arm is not long enough, but have pretty good distance vision? If you answered yes to these questions, then you probably have presbyopia, a condition where the eye exhibits a progressively diminished ability to focus on near objects with age. On the surface, the fix is reading glasses (those things you always forget just when you need them most). Bright light also helps, as it constricts the pupils, and decreases spherical aberration. Some people use prescription bifocals, trifocals or multi-focal lenses.

Underwater the solution is a 'Gauge Reader' mask fitted with what the dive industry refers to as Bifocal corrective lenses. These underwater bifocal corrective lenses for masks aren't quite what people are used to with bifocal prescription glasses.

With Gauge Reader dive mask bifocal corrective lenses, the lower pane (roughly a third) has the plus dioptre reading correction, and the rest of the lens is 'Normal' or 'Plano'. That's why they're referred to as Gauge Reading lenses. You need to know the dioptre value for your reading glasses.

Dive mask with bifocal lenses
Bifocal lens mask with gauge reading correction lenses.
Normal (plano) vision for top two thirds and "reading" (plus) correction for bottom third.
Supplied with the bifocal lenses fitted, plus the original normal (plano) lenses.

Bifocal / Gauge Reading corrective lenses are typically available in a dioptre range of +1.0 to +4.5, in 0.5 increments. If you have a quarter dioptre prescription, then increase to the next higher/stronger dioptre. Your eyes will inevitably change and within a few years, you will need the stronger dioptre. Now you can select a mask that has Bifocal / Gauge Reader corrective lenses available with the dioptre value(s) you need.

Note: The bifocal correcting mask lenses we sell have the reading correction attached via a permanent bond by the lens manufacturer. The correction is not an after-market 'stick on' or 'glue in' lens that is not permanent. Our own experience, plus that of our customers, very plainly tells us that none of the after-market 'stick-on' solutions work well, and thus we don't bother selling them.

Please note that all of the masks listed here can have corrective lenses fitted, but only a few of the masks can have bifocal, gauge reading corrective lenses fitted.

What Corrections Do We Offer?

We offer the following levels of prescription/correction, in half dioptre increments:

  • Minus lenses from -1.0 to -9.0*
  • Plus lenses from +1.0 to +4.5*
  • Bifocal lenses from +1.0 to +4.5*

* available on selected masks only.

Please Note: The scripts issued by optometrists use quarter dioptre increments. We can only provide half dioptre increments. This is another reason why you should consult your optometrist, as they will be able to come up with the values you need.

What If I Have Astigmatism?

None of the 'off the shelf' corrective lens masks correct astigmatism, so if the majority of your prescription is astigmatism, or you have astigmatism over 2.00 dioptres, you will need a custom made product for best visual results.

If your astigmatism is less than 2.00 dioptres, or is not the majority of correction, then the corrective lens mask solutions we can provide should be fine. This is another reason why you should consult your optometrist.

Please Consult Your Optometrist

We strongly recommend that you consult your optometrist about which underwater vision correction solution is best for you. We recommend you show them this information. Your optometrist will be able to work out which corrective solutions are available to you and make recommendations as to what to get, plus provide the two dioptre values we need.

We are not optometrists and can't read your script to determine if a corrective lens mask will work for you. Correction lenses typically will work for the vast majority of people, but some eye shapes can't be accommodated this way.

Your prescription may need to be changed because the distance between the lens of your diving mask and your eyes typically is different from the distance between your eyeglasses lenses and your eyes. (This also is one of the reasons your contact lens prescription is different from your eyeglass prescription if you have moderate or high myopia.) An eye care professional specialising in sports eyewear can adjust your prescription for underwater use.

Your optometrist will also be able to provide you with the best spherical correction dioptre values for your left and right eyes given the half dioptre increments of corrective lenses. Then you can order your corrective lens mask from The Scuba Doctor with confidence in achieving a great outcome.

Whatever your preference, there are plentiful corrective options available to ensure that everyone can see clearly to experience the beauty and wonder of the underwater world.

Recommended Optometrist:

Melbourne: David Glennie is an optometrist and experienced scuba diver. His team can check your eyes and translate your script into the values we need for your corrective lenses. They can even show you how it will work.

David Glennie, Karingal Optical
Shop 39, Karingal Hub, 330 Cranbourne Road, Frankston VIC 3199
Tel. 03 9789 4811   www.facebook.com/KaringalOptical/

Fitting the Mask Corrective Lenses

If you buy a complete mask with two corrective lenses from The Scuba Doctor, we will fit the lenses to the mask for you before sending the mask out. You will also receive the original normal (plano) lenses, placed inside the packets the corrective lenses came in.

Corrective Lens Mask Delivery

Order today and your mask with corrective lenses will be assembled and usually Ship the next Business Day.

We typically place orders for your mask with corrective lenses with our suppliers the same day we receive the order from you. In some cases, they will be assembled and shipped directly to you from the suppliers the same business day, or if not, the next business day. Our suppliers are Sydney based, so you need to allow for the usual postal delivery times for the package to reach you from Sydney.

Colour Options: Many of the masks are available with heaps of colour choices. However, sometimes our suppliers get low on some colour options. Please enter any other mask colour options you'd be happy with in the comments during the checkout process. Then we have options to switch to so that your order isn't delayed.

Other Considerations

Custom made prescription lenses made to your exact prescription are sometimes preferred by more advanced divers, for those shooting underwater photo/video, or those who need a bifocal lens with two different types of correction in each lens. We suggest you try Ozbob Scuba for custom made prescription scuba masks.

Because you asked... the negative and positive vision-correcting mask lenses we sell have the magnification ground into the lenses themselves. The bifocal gauge reading correction is attached via a permanent bond by the lens manufacturer. The correction is not an after-market 'stick on' or 'glue in' lens that is not permanent. Our own experience, plus that of our customers, very plainly tells us that none of the after-market 'stick-on' solutions work well, and thus we don't sell them.

Contact Lens Wearers: Not all contact lenses are suitable for diving. Gas permeable lenses (GP lenses) can 'dig' into the eyes below certain depths, because of the pressure. Soft contact lenses can collect waterborne organisms and become contaminated, causing eye infections. If you wear contact lenses under your mask for diving, you need to make sure you blink a lot. Excessive starring can cause bubbles to form underneath your lenses and which may cause minor discomfort and temporary blurring of vision. Also, be sure to have a spare set of contacts (or glasses) available in case you lose a contact lens underwater.

Health Fund Refunds

As best as we can tell, you will be unable to claim a refund from your health fund for the supply of a corrective lens mask. Most health funds require a medical provider item code for a claim to be successful and no dive manufacturer or dive shop we know of has this. However, you may wish to check with your health fund to see if they are more generous.

More Information

For more information please see our Scuba Buying Guides: Buying a Great Dive Mask and Avoiding Mask Squeeze, plus our Dive Gear Features pages: Mask Features and Fixing Underwater Vision Problems.

Note: Diving/snorkelling masks are very different to Swimming Goggles. See Goggles vs Masks. We have available Prescription Swim Goggles.



Fixing Underwater Vision Problems

Fixing Underwater Vision Problems from The Scuba Doctor

Huge range of masks at The Scuba Doctor
Huge range of masks
at The Scuba Doctor
For those whose eyesight requires corrective measures, the prospect of scuba diving or snorkelling — a primarily visual pastime — can be a little daunting. Proper diver safety also relies on keeping a keen eye on your buddy, your location and your gauges. But a lack of 20/20 vision is by no means a barrier to diving, as there are many options available to facilitate participation despite all manner of sight issues.

Vision Problems

There are a number of factors behind the causes of visual impairments, including genetic malformation, disease, and — as with so many other things — the passage of time. Eye disorders brought on by conditions such as glaucoma, cataracts and diabetes require medical treatment or surgery, but by and large, defects in the optical elements of the human eye can be aided by the application of corrective lenses. These are collectively known as Refractive Visual Impairments and can be broadly split into four main categories: myopia, hyperopia, presbyopia and astigmatism (see the Types of Visual Impairments section below).

Underwater

Many scuba divers and snorkellers with mild vision impairment don't need to take any corrective action, as objects in water are naturally magnified by 33 percent. Divers who have more complex corrective requirements, however, will find this insufficient. If corrective measures are needed, there are several methods of compensating for sight problems underwater, making for safer, more enjoyable dives.

Contact Lenses

One of the simplest ways to deal with poor eyesight is to wear contact lenses, just as you would on land. However, not all contact lenses are suitable for diving. Even with suitable soft contact lenes, certain precautions should be taken to minimise eye irritation and to prevent losing the contacts.

The Diver's Alert Network (DAN) recommends using soft contact lenses for scuba diving, rather than hard contact lenses.

Hard or Gas Permeable Contact Lenses (GP lenses). Gas permeable lenses can 'dig' into the eyes below certain depths, because of the pressure. The increased pressure may also cause hard lenses to suction to the eye, causing pain or discomfort. Hard contact lenses typically dry wearers' eyes out more too, resulting in redness and irritation upon surfacing. Bubbles can form between the hard lens and the eye, causing blurred vision, which effectively negates the purpose of wearing the contacts in the first place. Finally, hard contact lenses may cause the diver to experience blurred vision after a dive, as nitrogen is unable to escape the cornea properly.

Soft Contact Lenses allow the nitrogen absorbed by the eye while diving to escape; hard lenses do not. However, even soft contact lenses can collect waterborne organisms and become contaminated, causing eye infections. If you wear contact lenses under your mask for diving, you need to make sure you blink a lot. Excessive starring can cause bubbles to form underneath your lenses and which may cause minor discomfort and temporary blurring of vision. Also be sure to have a spare set of contacts (or glasses) available in case you lose a contact underwater.

Wearing soft contact lenses underwater also means keeping the eyes closed when performing any skills that require the flooding or removal of the mask. If you are enrolling in a scuba course, be sure to tell your instructor if you wear contacts so that he or she will allow you to keep your eyes closed during skills, and to wear a mask during surface water skills or swim tests.

Similarly, if you're using vision-correcting equipment, from contacts to a corrective lens or prescription mask, make sure to alert your buddy. If you should lose your mask underwater, your buddy needs to know that they'll need to help you find it.

In terms of comfort, even soft contact lens wearers often report some dryness as a result of diving; it's a good idea to bring lubricating drops with you to the site for use before and after diving. Rinsing lenses in fresh saline solution between dives can also minimise irritation from residual salt water. Divers should consider using disposable contacts for live-aboard trips so that they can use fresh ones each day.

Corrective Eye Surgery

The most permanent alternative is corrective eye surgery, but it is imperative to consult an ophthalmologist before your first dive, after surgery, in order to respect the healing period. If not properly observed, the effects of pressure and trapped gas on an unhealed incision could be incredibly painful.

Corrective Lens Masks

There are alternatives to wearing contacts while diving for those who are squeamish about using them or simply prefer not to. Depending on the severity and type of eyesight issues, the lenses of some stock masks can be quickly and easily replaced with pre-made corrective lenses.

Dive mask with corrective lenses
Corrective lens mask: the mask, plus two separate correction lenses.
Supplied with the corrective lenses fitted, plus the original normal lenses.

Some of the masks with optional vision correcting lenses can be obtained with either a '-' dioptre (e.g. -1.5 to -8.0), or a '+' dioptre (e.g. +1.0 to +4.5), typically in 0.5 increments. Some divers require distance vision correction, that is, the diver is 'near-sighted' and the Rx Sphere value is a '-' dioptre. Other divers require a '+' Rx Sphere value lens because they are 'far-sighted'.

At The Scuba Doctor we sell a lot of Corrective Lens Masks and have a great selection of models to choose from whatever your budget. Please consult our online dive shop for more information and the corrective lens mask solutions available.

Bifocal / Gauge Reader Corrective Lens Masks

Finding the numerals on your gauge too small, especially in the dark? Finding you arm is not long enough, but have pretty good distance vision? If you answered yes to all the above, then you probably have presbyopia, a condition where the eye exhibits a progressively diminished ability to focus on near objects with age. On the surface the fix is reading glasses (those things you always forget just when you need them most). Bright light also helps, as it constricts the pupils, and decreases spherical aberration. Some people use prescription bifocals, trifocals or multi-focal lenses.

Dive mask with bifocal lenses
Bifocal lens mask with gauge reading correction lenses.
Normal vision for top two thirds and "reading" (plus) correction for bottom third.
Supplied with the bifocal lenses fitted, plus the original normal lenses.

Under water the solution is a 'Gauge Reader' mask which uses bifocal corrective lenses. These lenses are clear on top, but have a reading correction in the bottom third of the mask lens. This makes them great for reading gauges, camera settings etc.

We do not recommend adhesive magnifying patches, which are applied to a stock mask lens. Our customers very plainly tell us the after-market 'stick-on' or 'push-on' solutions simply don't work well, and we don't bother selling them. For the corrective lens bifocal masks we sell, each of the lenses are ground just like you would expect on a pair of eyeglasses.

Full Prescription Lens Masks

For those with astigmatism or other, more extreme vision impairment, pre-made corrective lenses may not work sufficiently. Custom-made full prescription lenses ground by an ophthalmic specialist are an option, wherein mask lenses are made specifically to cater for your combination of distance, astigmatism and reading impairments. But it's very expensive. We recommend you talk to Ozbob Scuba.

The important thing here is to make sure that the person filling your prescription takes into consideration a variety of your needs. If you are a snorkeler you probably just need to see distance, therefore a distance only prescription should be fit in your mask. If you are a diver though, you may need both distance correction to see the underwater life and the near prescription to read you gauges, therefore, depending on your prescription, a true bifocal, or truncated, full prescription lens can be used.

Fortunately, most divers and snorkelers only need either negative distance correction lenses, or gauge reading corrective lenses — clear or planar on top and a lower pane with positive correction for reading.

Those who opt for prescription masks should consider purchasing two customised masks in case of loss or damage to one of them, as it can be exceptionally hard to find a replacement in many of the world's remote dive destinations.

Consult your Optometrist

We strongly recommend that you consult your optometrist about which underwater vision correction solution is best for you. Please feel free to show them this information, plus the more detailed information in the Prescription Lens Masks section of our online dive store. Your optometrist will be able to work out which solutions are available to you and make recommendations as to what to get.

Your optometrist will also be able to provide the full details you need to order a prescription lens mask. If you choose to go with a corrective lens mask, your optometrist will give you the best spherical correction dioptre values for your left and right eyes given the half dioptre increments of corrective lenses.

Understanding Prescriptions

Treatment for myopia, hyperopia and astigmatism involves testing by an optometrist (an eye healthcare specialist), or possible referral to an ophthalmologist (a medical doctor for eye conditions), to acquire a prescription for spectacles or contact lenses which can be constructed by an optician.

Presbyopia, for many people, can be treated by purchasing off-the-shelf reading glasses. Laser surgery is available but comes at a fairly eye-watering expense. Prescription lenses are custom-made to suit individual needs. Left and right eyes may often have very different levels of impairment. The following terminologies are generally given for each eye:

Sphere: Spherical lenses are required to correct near- and far-sightedness by compensating for the incorrect focal length of the natural eye. Corrections are given in dioptres (diopters in the US), a measure of the optical power of the lens based on its size and curvature. Negative dioptres are used to correct myopia, and positive dioptres to correct hyperopia and presbyopia. Dioptres are usually prescribed in increments of plus or minus 0.25.

Cylinder/Axis: Astigmatism is a condition that requires a lens that focuses light into a line, rather than a point, as is the case with spherical lenses. The cylinder strength is given as a dioptre, and the axis is the degree to which the cylinder is rotated to correct the direction of the aberration. Lenses that combine both spherical and cylindrical designs are known as toric lenses.

Add: This is an additional prescription, usually to compensate for presbyopia in conjunction with one of the other conditions, resulting in a different optical power in the lower half of the lens, creating 'bifocal' lenses.

Scripts for eye glasses are usually prescribed in dioptre increments of plus or minus 0.25. Most of the corrective lenses for mask are only available in dioptre increments of plus or minus 0.5. If your script for an eye is say -1.75 dipotre, your value will need to be adjusted up or down. Your optometrist or ophthalmologist will know what's going on with your eyes and usually be able to give you the adjusted left and right eye values we need. We can't do this for you, and we highly recommend you don't try doing it yourself. Consult your Optometrist!

Recommended Optometrist:

Melbourne: David Glennie is an optometrist and experienced scuba diver. His team can check your eyes and translate your script into the values we need for your corrective lenses. They can even show you how it will work.

David Glennie, Karingal Optical
Shop 39, Karingal Hub, 330 Cranbourne Road, Frankston VIC 3199
Tel. 03 9789 4811   www.facebook.com/KaringalOptical/

Types of Visual Impairments

Normal Vision

The eye functions by refracting light through the cornea, which covers the iris, the coloured part of the eye which dilates and contracts to control the amount of light passing through the pupil. This is then focused by the lens onto the retina at the back of the eye, which passes information to the brain via the optical nerve.

Myopia

Myopia: also referred to as short- or near-sightedness. It occurs when light entering the eye is focused at a point in front of the retina. Nearby objects appear normal, but distant objects appear blurry. Myopia is by far the most common form of visual impairment.

Hyperopia

Hyperopia: also known as long- or far- sightedness, hyperopia is the opposite of myopia. Light entering the eye is focused at a point beyond the retina causing nearby objects to appear blurry, but distant objects to appear normal. Hyperopia is the least common form of visual impairment.

Astigmatism

Astigmatism: this is the most complex of visual impairments, an irregular curvature of the cornea or lens can cause light to be focused not only before or beyond the retina but also unevenly across the retina’s surface. Astigmatism affects around 30 per cent of the population and causes blurred vision at all distances.

Presbyopia: Presbyopia is a natural part of the ageing process, whereby a hardening of the lens prevents the eye from focusing on nearby objects and causes difficulty with the reading of text, especially in poor light conditions. Presbyopia occurs in everybody as they age, however its effect may be more pronounced in some individuals than others. Presbyopia can occur in people with pre-existing conditions, often resulting in the need for bifocal lenses.

Whatever your preference, there are plentiful corrective options available to ensure that everyone can see clearly to experience the beauty and wonder of the underwater world.

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