prescription swimming goggles

IST G40 Optical goggles

Usually despatched within 24 Hours

IST G40 Optical goggles

IST more than just diving masks

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From IST, pioneers in prescription diving masks, comes the G40 optical goggle. This goggles features lenses made of strong impact resistant polycarbonate. In addition, the lenses block out harmful ultraviolet rays and have a long lasting anti-fog system to prevent fogging.

  • to correct long or short sight
  • different sized interchangeable nose bridges
  • comes in a single colour
  • same power in each eye
  • pre-assembled
  • hard plastic case
  • circumference of goggle (eye pieces, medium bridge & strap (unstretched)), approximately 544mm
  • seal/eye piece width 44mm
  • seal/eye piece length 56mm
  • seal/eye piece depth 13mm
  • optical centre of goggle approximately 72mm (depending upon nose bridge used)

At Butterflies Healthcare, we try to make sure our customers are always 100% happy, not only with the products they buy but also the service we provide. However, buying online can seem more difficult for certain products. We want to reassure you that we offer you an easy and trustworthy online service. As we are owned by a qualified optometrist, we really understand your visual needs.

Our customer service team are always happy to offer advice and guidance for product selection or any enquiry you may have. We can offer expert advice on the best prescription goggles for your needs and are able to supply prescription goggles to suit most people.

You have the right to cancel the contract at any time up to the end of 14 days after the day on which you receive the goods (30 days in the case of faulty/damaged goods). To exercise your right of cancellation, you must give written notice to us by post or e-mail giving details of the goods ordered and (where appropriate) their delivery. You can use this model instruction to cancel email template if you wish.

Off the shelf goggles

If you purchase any ‘off the shelf’ goggle from us, so long as it has not been used in the water you can return in the original packaging for a full refund or exchange.

Custom made goggles

Custom made products, such as the Swimvision II, can only be returned if there is a fault with the goggles. For this reason we offer a trial fitting service where we can send you an empty goggle to try on first to ensure the fit is suitable. Please contact us for more details.

Should you find any fault with your goods then simply return them to us explaining the problem. We will then either rectify the matter or offer a full refund. Please bear in mind the following:

  • When you receive items you have ordered, we recognise that you may want to try them on to ensure the fit and feel is as you envisaged. In the case of swimming goggles do this before using in the pool, for swimwear wear underwear underneath.
  • Please remember, we can only issue you with a refund or exchange if the returned product concerned is in a fully re-saleable condition. This means that they must be unused and in the original packaging.
  • Return postage and packing costs will be met by the customer (except for faulty/damaged items) but no postage and packing charges will be added for exchanged items.

Your rights to return goods are protected under the EU Distance Selling Directive which can be found at

All orders are delivered from the UK


  • £3.00 2nd class (4-5 working days)
  • £4.00 1st class (1-2 working days)
  • £8.00 Special Delivery or APC overnight* (next working day)


  • £5.00 (Ireland, France & Germany) by Royal Mail Max Sort (no tracking)
  • £10.00 by Royal Mail Tracked and/or Signed (depending upon location)

Rest of the World

  • £9.00 (Australia & New Zealand) by Royal Mail Tracked and/or Signed (depending upon location)
  • £13.00 (Canada & USA) by Royal Mail Tracked and Signed
  • £15.00 by Royal Mail Tracked and/or Signed (depending upon location)

PLEASE NOTE: orders shipped outside of the EU are processed excluding UK taxes but import duties and/or taxes may be applicable in your delivery country for which YOU ARE LIABLE.

General Information

Your order will be sent to the delivery address according to this schedule:

  • For goods that are held 'in-stock', we aim to despatch orders placed before 1pm Monday to Friday the same day (excluding bank holidays). Orders placed after 1pm will leave on the next working day (so on Friday this will normally mean Monday)
  • Items we have to order in are usually despatched within a week
  • Custom made goggles and masks are usually despatched within 2-3 weeks If you need your order urgently or by a specific date please contact us to ensure we can meet your delivery requirements.

* Special Delivery/APC Overnight does not cover Saturday delivery. Therefore, orders placed after 1pm Thursday and before 1pm Friday will be despatched on Friday and delivered on Monday. Also Special Delivery/APC Overnight do not offer next day delivery to Northern Ireland, certain parts of the Scottish Highlands and offshore islands (e.g. Channel Islands).

We DO NOT deliver to shipping houses such as Aramex House.

International orders will be despatched in accordance with the above schedule but can take up to 28 days to arrive.

Feefo Reviews
Comfortable fit for my son. Great product! Recommend
Feefo Reviews
A truly brilliant product at last I can see whilst swimming.
Feefo Reviews
excellent help over telephone to get right prescription
Feefo Reviews
Cumfy to ware
Feefo Reviews
They make all the difference, fit well, no leaks and value for money.
Feefo Reviews
Great service. Very quick delivery and friendly customer service. I had to contact them as my parcel was opened and the Google’s must of fallen out on route to me. They replaced with in 24 hours. Goggles are excellent quality.
Feefo Reviews
Fantastic product at a great price. Have purchased another for my daughter
Feefo Reviews
Would like bigger frames for open water
Feefo Reviews
Good quality and very good service
Feefo Reviews
Great kids goggles for the price
Feefo Reviews
The only reason I say poor is because I can’t get a seal because the distance between my eyes is quite small and even with the smallest noseband I can’t get them to fit properly. So if there was a bit more info on which goggles are best for narrow eye gaps I could have chosen the right ones. I will attempt to get a better fit pair from your company as the service and turn around time is very good.
Our ResponseSorry these goggle have proved a little too large. Try using the filter we have of 'Smaller Head/Eye Size' to show only the narrow fitting goggles which may be more suitable.

Feefo Reviews
This was for my son, who is very fussy about about his things. He loves it. Says it fits very well.
Feefo Reviews
Very reasonably priced. Goggles are brilliant, I can see clearly in water. Fits securely and doesn’t let water in.
Feefo Reviews
great product.
Feefo Reviews
Because the goggles were not very expensive I wasn’t expecting a lot from them, but they are very good quality and the lenses are spot on, I certainly would recommend them.
Feefo Reviews
Tint is useful ,and stops the glare from the pool lights
Feefo Reviews
Brilliant product and service
Feefo Reviews
Totally changed my swimming experience. My strong +7 goggles mean I can actually see again, they are fabulous. They arrived ahead of time, wonderful.
Feefo Reviews
Goggles are great I can now see in the swimming baths ,read notices. Good fit ,seal well ,fog free.
Feefo Reviews
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Contact Us

0330 660 0796 Open 9am to 5pm, Monday-Friday ?subject=Prescription Swimming Goggles - United Kingdom">Click here to email us
Butterflies Healthcare
The Granary
Manor Park
OX17 2AG
United Kingdom
Feefo Gold Trusted Service