A contact lens prescription is typically made up of the following:Basecurve (BC): This number indicates how curved your contact lens is. Your optician will try and match the curve of your contact lens to the curve of your eye to find the best fitted contact lens for you. E.g. BC 8.4.Diameter: This stands for Diameter and is the length of the contact lens from one edge of the lens to the other. This is effectively the size of the contact lens and is used to make sure the contact lens covers the correct parts of your eye. E.g. DIA 13.8.Power (pwr) / Sphere (sph) / Dioptre (D): This value is the power of the lens needed to correct your long or short-sightedness and is measured in Dioptres (D). A minus (-) sign indicates that you are short-sighted, whereas a plus (+) sign shows that you are long-sighted. The higher the number, the stronger your prescription.Contact lens name: Most contact lens prescriptions will have a brand/type/manufacturer name so that it is possible to reorder your lenses provided the prescription is still valid. E.g. 1 Day Acuvue Moist.Cylinder: This is the amount of astigmatism you have and is to do with how curved the structures in your eye are. If this section is empty you do not have astigmatism and are just long or short sighted. If you do have astigmatism, a value will be entered in this box along with an Axis. E.g. Left eye: -2.25, Right eye: -2.25.Axis: Measured in degrees, this value is normally between 0-180 and is the direction where an extra power is added in the contact lens to correct your astigmatism. E.g. 10.Additional power: This is the magnifying power added to your multifocal contact lenses to help with reading and close work. This can be recorded as High, Low, Medium or with the power value itself and will always be a + value. E.g. ADD LOW.