PRESCRIPTIONS - CONTACT LENSES

• General
• Base Curve (BC)
• Diameter (DIA)
• Spherical Power (SPH)
• Cylinder (CYL)
• ADD
• Colour

Before you place your contact lens order you will need to know the prescription details for your contact lenses. Your optician has a legal obligation to provide you with a legible copy of your prescription, but don't worry if yours is difficult to read, e-mails us, call our number 020 8269 0737 or come and visit us at our Greenwich showroom, close to Lewisham, Docklands and Canary Wharf.

On the contact lens packaging, lens foil or your contact lens prescription will be written a series of numbers. These are your contact lens prescription parameters.

Occasionally, for some lens brands, a parameter is fixed across the entire range. In this instance the parameter may not be displayed on the packaging but it should always be written on the contact lens prescription issued by your optician.

The Base Curve (BC) is generally the first figure you will see and is always a decimal number (e.g. 8.4).

The DIA is generally the second figure and has a value of about 14.00.

The Spherical Power (SPH) is a decimal number preceded by a + or - sign (e.g. +5.25 or -6.75).

Many eyes have a front surface shaped like a rugby ball rather than a football. This is called astigmatism and may require a toric contact lens. The toric lens power is known as a Cylinder (CYL) and the axis denotes the orientation of the cyl.

A bifocal or multifocal lens has an additional focal power for reading. This is the ADD.

It is important that you give us all the information contained on your prescription form. Below are several examples of what you prescription may look like; Some boxes may be left blank or there may be additional information not shown in these examples, whatever format your prescription comes in you must forward all the information to us in order for us to complete your glasses.

Your prescription may look like this:

If you wear special torics contact lenses then your prescription may look like this:

If you wear bifocal contact lenses your prescription may look like this:

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