Choosing the proper strength of lens

The selection of appropriate corrective lenses for the swimming goggles does require some understanding of your visual acuity requirements and your most recent prescription.

First Step: Find out what your existing eyeglass prescription is! The person who tested your eyes or who dispensed your last pair of glasses will have this information and will give you the details. The prescription numbers will contain some uncommon terms:

Special Considerations: Always move DOWN to the closest step dioptre! If calculation of your prescription shows that you should have a -2.75 (step dioptre lens) then you should choose a -2.5 lens for the swimming goggles. This causes less strain and you will be unlikely to notice any significant loss of acuity within a reasonable distance. There is also a slight magnifying effect when underwater.

Step Dioptre Lens - In order to produce lenses for swimming goggles, and keep the price reasonable they are made in one-half (.5) dioptre increments. These lenses are not a full custom prescription and do not correct for cylinder or astigmatism. They are not intended for full time wear. Extended wear of step dioptre lenses will cause various degrees of eye strain but they are more than adequate for occasional wear especially if the cylinder is close to or less than 1.

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Fitting your prescription swimming goggles

The use of high quality silicone seals means that less pressure is required to form a good leak proof seal and this also helps in fitting a wide range of facial shapes and sizes.

Getting a good seal is only possible if you choose the correct nose bridge size. This is really the only adjustment possible except for the head strap tightness. It is also important for minimizing eye strain to set the goggles distance between eyes. That's why we supply few different bridges when most companies give you one. We recommend fitting the nose bridges and checking for a good seal before fastening the head strap.

Silicone seals are basically "suction devices", if properly positioned over the eye you can gently push in on the lens and the seal should form a small vacuum under the cup when you release the pressure. In order to properly position each cup you must adjust the nose bridge S, M or L or use the adjustable silicone covered band, so that both eye cups seal properly.

The strap should be adjusted so that it is just tight enough to seal properly. These silicone seals require lower pressure than cheaper PVC seals.