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How to read your contacts prescription

How to enter your contacts prescription

OD is an abbreviation for the Latin term oculus dexter which means right eye. Notice that the right eye information is asked for first even though we typically read from left to right.

OS is an abbreviation of the Latin oculus sinister which means left eye. That will be referenced on the far right column of the prescription.

B.C. is short for base curve measurement indicates the back curvature of your contact lens, in millimetres. This is important for comfort, as the BC of your contact lenses should match your eye's natural curve as closely as possible to ensure a better fit when you are wearing your contact lenses.

DIA is short for "diameter," or the distance from one edge of the contact lens to the other. This is measured in millimeters.

SPH is short for sphere. The sphere of your prescription indicates the power on the lenses that is needed to see clearly. A plus (+) symbol indicates the eyeglass wearer is farsighted. A minus (-) symbol indicates that the eyeglass wearer is nearsighted.

CYL is short for cylinder. The cylinder indicates the lens power necessary to correct astigmatism. If the column has no value (is blank), it indicates that the eyeglass wearer does not have astigmatism. If this is the case on your prescription, you can leave it blank when entering it in.

AXIS is a prescription will include an axis value for those with astigmatism. This number represents the angle of the lens that shouldn't feature a cylinder power to help correct your astigmatism.

ADD is short for "additional correction." This is where details about bifocals, multifocal lenses or progressive lenses would appear.

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How to read your glasses prescription

How to enter your glasses prescription

OD is an abbreviation for the Latin term oculus dexter which means right eye. Notice that the right eye information is asked for first even though we typically read from left to right.

OS is an abbreviation of the Latin oculus sinister which means left eye. That will be referenced on the far right column of the prescription.

SPH is short for sphere. The sphere of your prescription indicates the power on the lenses that is needed to see clearly. A plus (+) symbol indicates the eyeglass wearer is farsighted. A minus (-) symbol indicates that the eyeglass wearer is nearsighted.

CYL is short for cylinder. The cylinder indicates the lens power necessary to correct astigmatism. If the column has no value (is blank), it indicates that the eyeglass wearer does not have astigmatism. If this is the case on your prescription, you can leave it blank when entering it in.

AXIS is a prescription will include an axis value for those with astigmatism. This number represents the angle of the lens that shouldn't feature a cylinder power to help correct your astigmatism.

ADD is short for "additional correction." This is where details about bifocals, multifocal lenses or progressive lenses would appear.

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Measurements
If you already have a pair of glasses, you can compare the measurements to your current frame. Just look inside your temple to find your frame measurements. The overall frame size is a combination of lens and bridge's width measurements.
Lens Width Bridge Width Temple Length
XS < 42 mm < 16 mm <=128 mm
S 42 mm - 48 mm 16 mm - 17 mm 128 mm - 134 mm
M 49 mm - 52 mm 18 mm - 19 mm 135 mm - 141 mm
L >52 mm >19 mm >= 141 mm

Our returns & exchanges policy

Our Promise

We at OptiContacts.com understand that sometimes things change, which is why we offer a free 30-day return policy and free 365-day exchanges.

We're committed to being responsive in the way that we address returns and exchanges.

Glasses & Sunglasses

We offer free 30-day returns for glasses as well as sunglasses. Frames may be returned for store credit or refund provided that the item is unused and unscratched as well as in its original condition and packaging. Frame returns must include all materials originally sent (cases, cloths, and lenses).

Store credits do not expire and returns are free.

Please call our customer care team at 1-866-982-5367 and they will be happy to help you process your return or exchange!

Contact Lenses

We offer free 30-day returns for contact lenses. Contact lenses may be returned for a refund, which will be processed within 30 days from the receipt of your order at our processing center, if they are in their original condition, unopened, complete, and sealed without writing or markings on the packaging.

We also offer a 365-day return program for prescription contacts.

We will take back unopened boxes of your old prescription, and credit the value towards your new prescription.

When your contact lens prescription changes, we will accept returns for store credit within 365 days from the day that you receive your order. This store credit can be applied to any future purchases from OptiContacts.com and do not expire.

Returned contact lenses must be in their original packaging and condition, unopened, complete, and sealed, without any writing or markings.

Please call our customer care team at 1-866-982-5367 and they will be happy to help you process your return and work with you for our prescription contacts value credit system!