Please refer to the glasses prescription provided by your optician and insert the sphere and cylinder values in the boxes below.
PLEASE ENSURE YOU INDICATE WHETHER THE VALUES ARE POSITIVE OR NEGATIVE. PLEASE NOTE THAT THE + OR – SIGNS ARE SOMETIMES SHOWN ABOVE THE NUMBER RATHER THAN IN FRONT OF IT.
If you cannot find your prescription your optician should be able to provide you with the information you need.
Please note that we can make a certain allowance for astigmatism by combining a proportion of the cylinder value (measure of astigmatism) and the full sphere value. If the calculated power is then between two available powers the most suitable one is selected.
Trials we have carried out show that it normally takes a short time for eyes to become adjusted to the goggles. Also in some cases, particularly for complex prescriptions, the lenses may not provide the same precise level of correction as your glasses but they are perfectly suitable for swimming activities.