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Prescription & fit

SPH, CYL, AXIS, ADD, BC, DIA — what every number on your prescription means, and how to match it to a box.
They define the lens you need: SPH = power, CYL = astigmatism strength, AXIS = its direction, ADD = near-vision boost, BC = curvature, DIA = diameter.
Glasses sit ~12 mm in front of the cornea; contacts sit on it. The optical distance changes the effective power, especially above ±4.00 D.
On a contact lens prescription — not on a glasses prescription. Look on the lens box itself if you have an old pack: BC and DIA are always printed.
Yes — contact us with the new prescription and we change the next shipment. Unopened boxes from the previous prescription can be returned for credit toward the new ones.
In most EU countries you need a valid contact-lens prescription, but for repeat orders of the same brand you usually only need to confirm it has not expired.
Common SPH/CYL/AXIS combinations are in stock. Less common ones are special-order with 5–10 working days lead time. Place the order and we confirm by email.
Most brands ship in a single BC/DIA (e.g. 8.6/14.2) that fits most eyes. If your fitter omitted them, contact the practice and ask — don't guess.
Right eye = OD (Oculus Dexter), left eye = OS (Oculus Sinister). The values on your prescription often differ between eyes — keep the boxes labelled.
Typically 1 to 2 years in the EU, depending on country and your optician's policy. Re-check yearly is recommended even if the prescription has not changed.
Only if the new lens has the same SPH, CYL, AXIS and ADD AND a compatible BC/DIA. Material differences may still warrant a refit.
SPH corrects uniform near- or far-sightedness. CYL corrects astigmatism — when the cornea is shaped more like a rugby ball than a football.
AXIS is the angle (0°–180°) at which the cylinder correction is oriented in your lens. Read it like a clock face — 0° to the right, 90° straight up, 180° to the left.
Very. A 0.1 mm BC mismatch or a 0.3 mm DIA mismatch can cause poor fit, lens slip, and corneal irritation.
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