DIA: Diameter - the distance across the surface of the contact lens, measured in millimeters. This number is usually between 13 and 15 and determines where on your eye the contact lens will sit. If this measurement isn't correct the contact lens will be uncomfortable and may scratch your eye.
What do the numbers on the side of my contacts box mean?
Common codes on your contacts package This is the amount of correction, measured in diopters, that is needed to bring your vision to your maximum visual acuity. Dia = Diameter, measured in millimeters. This number is usually between 13 and 14.5. BC = Base Curve refers to the back curvature of the contact lens.May 6, 2019
What number is the power on contact lenses?
Power (PWR): Strength of your contact lens (e.g., -1.00, -1.25, +1.50, +3.00, etc.) Base Curve (BC): Inside curve of your contact lens (e.g., 8.0, 8.1, 8.2, etc.)
How can you tell the prescription of a contact lens?
Your prescription details can be found on the side of your contact lens box. If you don't have your box, we're happy to contact your eye care provider to get a copy of your prescription for you.
How many contacts come in a box dailies?
If your plan is only to wear contacts occasionally, this is one of the best reasons to purchase daily lenses. Packs generally come with 30 lenses, and therefore a one-month supply will last you quite a while – with no need to buy expensive disinfectants or replenish your lenses frequently.Jun 12, 2017
How many boxes is a 3 month supply of contacts?
1- to 2-week disposable lenses Typically, weekly or biweekly contacts come in a pack of six. If your eyes have two different prescriptions, you'll need to get a minimum of two boxes at a time for a 3-month supply.May 30, 2021
How many contacts are in a 90 pack?
The number of items per pack always indicates the actual number of lenses (not pairs). If you have the same prescription in both eyes, you can look at the number as half of the amount of contact lens pairs. In this case (90-pack), it would mean 45 pairs = 45 usages.
What do the numbers on my contacts box mean?
BC: Base Curve - this refers to the back curvature of the contact lens, measured in millimeters. ... DIA: Diameter - the distance across the surface of the contact lens, measured in millimeters. This number is usually between 13 and 15 and determines where on your eye the contact lens will sit.
Can you figure out your eye prescription online?
Thankfully, if you have a pretty basic prescription (meaning they're not bifocals, progressives or Coke-bottle lenses), there's a free tool from GlassesUSA.com that can scan your current glasses.Jul 2, 2019
Is there a big difference between 8.4 and 8.6 base curve?
Studies show that a single base curve of 8.4mm managed a “good or better” fit in approximately 90% of individuals,1 and base curves of 8.4mm and 8.6mm together encompassed 98% of individuals.Sep 1, 2017
What is the normal BC for contact lenses?
Typical base curve values range between 8.0 and 10.0 mm, though it can be flatter (from 7.0mm) if you have a rigid gas-permeable lens. A person with a higher base curve number has a flatter cornea (the clear, front surface of the eye) compared to someone with a lower base curve number, which indicates a steeper cornea.
Does the BC on contacts matter?
Yes they do matter. The BC, or base curve, is measured based on your cornea's curvature. If the base curve is too small, it'll squeeze your eye, and if it is too big, it won't stay on your cornea. These both may cause damage to your eye.