A contact lens specification contains the power, base curve (
BC) and diameter (
DIA) of your lenses; if you wear toric lenses, it will also contain the cylinder and axis you require. All of this information can be found on your lens packaging as well as on your prescription.
The Iris Online website has an interactive database: you will only be offered a choice of the powers, base curves and diameters available for each particular lens. Many lenses are available in only one base curve and only one diameter, and in these cases you will be offered only one choice.
If you have any problem understanding your contact lens specification, please or phone us on 020 7407 7951 (lines open 9.00am - 7.00pm Monday to Friday).
