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<div><p>Your contact lens prescription allows you to purchase contact lenses that match your requirements from opticians or online suppliers. You should be given a prescription after a successful contact lens fitting. If you weren't given a prescription, in Ireland, it's your legal right to have a copy, so don't be afraid to ask your optician for it.</p></div>

How to read your contact lens prescription

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<div><p>If you want to buy contact lenses online from suppliers like Vision Direct you need to fully understand your prescription in order to purchase the correct lenses. You can find your prescription on the piece of paper given to you by your optician during a check-up, on the end/side of your contact lens box or on the blister packs that contain your contact lenses.</p><p>A written prescription usually includes the following specifications: base curve, diameter, power (or sphere), and then additional figures for Cylinder and Axis if you have an astigmatism, and Addition and Dominant figures for presbyopia correction.</p><p>The prescription for your left and right eye will be listed separately as they can vary.</p></div>

How do I read my prescription?

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<div><p><br/></p><table><tbody><tr><td><br/>Base curve</td><td>Diameter</td><td>Power/Sphere</td><td>Cylinder</td><td>Axis</td><td>Addition</td><td>Dominant</td><td></td></tr><tr><td>Left</td><td>8.4</td><td>14.0</td><td>-0.50</td><td>-1.25</td><td>10</td><td>&gt;+1.0</td><td>N</td></tr><tr><td>Right</td><td>8.4</td><td>14.0</td><td>-1.25</td><td>-1.25</td><td>10</td><td>+1.0</td><td>D</td></tr></tbody></table></div>

Example prescription

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<div><p>Name &amp; expiry date: Your prescription should also contain the name of your contact lens e.g. Acuvue Oasys and an expiry date, which is usually a year from the date of your check-up.</p><p>Below is an example of the prescription listed on the side of the box for 1-Day Acuvue Moist for Astigmatism.</p><p>Please be aware that a contact lens prescription is different to a glasses prescription, so you cannot use one for the other.</p></div>

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<div><p>Base Curve (BC): The base curve determines what type of fit is required for the lens to meet the curve of your eye; this is usually written in millimeters or sometimes with the words: flat, median or steep.</p><p>Diameter (DIA): The diameter of the contact lens is also written in millimetres and determines the width that best fits your eye.</p><p>Power/Sphere (PWR/SPH): This figure shows whether you are long or short-sighted and how much correction your eyes require. If you are long-sighted your figure will begin with a + (plus sign) and if you are short-sighted it will begin with a – (minus sign). This will be followed by a number that goes up from 0 in measures of 0.25 dioptres, the higher the number the stronger the visual correction needed (this value can be displayed on the box as "PWR" or "D").</p></div>

What does each prescription figure mean?

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<div><p>The below figures are only displayed on contact lens prescriptions where there is a need for astigmatism correction.</p><p>Cylinder (CYL): The cylinder will always be a minus number that increases in measures of 0.25. Much like the power/sphere figure that is shown on all standard prescriptions, the cylinder denotes the extra visual requirements needed for astigmatism and how severe the astigmatism is.</p><p>Axis (AX): Astigmatism is caused by the irregular curvature of the eye; the axis is a figure which determines the angle of the correction needed in order to see clearly. The Axis is always a number between 0 and 180 degrees.</p></div>

Prescription figures for astigmatism

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<div><p>The below figures are only displayed on contact lens prescriptions where there is a need for presbyopia/multifocal correction.</p><p>Addition (ADD): If you suffer from presbyopia it affects your near vision, the Addition figure determines what level of correction you need to be able to see clearly at a close distance. This is a number between 0.50 and 3.00, some contact lens brands refer to this as a high, medium or low.</p><p>Dominant: If you wear multifocal contact lenses or bifocal contact lenses, the correction is determined by a dominant and non-dominant eye, this is the dominant figure usually marked with a “D” and “N” to express which eye is which.</p></div>

Prescription figures for presbyopia

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Understand your Contact Lens prescription with our easy to follow guide. Ensure that you get the correct contact lenses for your opticians prescription.

How to read your contact lens prescription | Vision Direct

Understanding your contact lens prescription

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Base curve	Diameter	Power/Sphere	Cylinder	Axis	Addition	Dominant
Left	8.4	14.0	-0.50	-1.25	10	>+1.0	N
Right	8.4	14.0	-1.25	-1.25	10	+1.0	D