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What values do I enter in the prescription information fields?
On the product page for your contact lenses you will be asked to enter your prescription details.From left to right the different specifications mean: | |
Base Curve (BC): | The curvature of the lens in millimetres usually between 8.3 and 9.0. |
Diameter (D): | The diameter of the contact lens. This number ranges from between 13.8 to 14.5. |
Power (PWR/SPH): | Is a + or - figure followed by a number e.g. -4.50 or +0.25. This represents the level of visual correction needed, and whether your lenses correct long-sightedness (plus/+ powers) or short-sightedness (minus/- powers). For some contact lenses the power may also be 0.00, plano or displayed with this symbol ∞ which is for non-prescription use e.g. coloured contact lenses. |
If you have astigmatism the following values will also be required: | |
Cylinder (CYL): | A minus number that increases in a scale of 0.25 dioptres, ranging between -0.25 to -2.75. |
Axis (AX): | A number between 0 and 180, that determines the direction needed to correct your astigmatism. |
If you wear multifocal contact lenses the following values will also be required: | |
Addition (ADD): | A + number between 0.50 and 3.00, or referred to as high, medium or low. This is an additional power that determines the level of correction needed for you to focus on near objects. |
Dominant (D): | A choice between "D" and "N" to determine which is the dominant and the non-dominant eye. |