X

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.

X

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.

Close Modal Icon
Bonus sunglasses included
KITS Pace Image
We're adding a complimentary pair of sunglasses to your order.
To redeem, simply use code BOGO at checkout, your free sunglasses will be automatically added to your order.
Shop glasses Shop sunglasses
Close Modal Icon
4th of July Sale: $25 credit promotion
How it works:

1. Shop the sale: Buy any KITS glasses, designer frames, or contact lenses during the 4th of July Sale.
2. Get your $25 credit: We'll email your credit code by July 20, 2026.
3. Save again at checkout: Apply your code on a future order of $100+ before October 18 2026.

CREDIT TERMS:
$25 credit issued after qualifying purchase, valid on a future merchandise order of $100+ (pre-tax, excluding shipping) placed by October 18, 2026 - order considered placed at time of submission. Credit will be emailed by July 20, 2026. Applies on top of insurance pricing where applicable. Limit one credit per customer. Single use. While quantities last; selection and availability may vary; no rain checks. Cannot be combined with any other offers or promotions except where expressly permitted. If the qualifying purchase is returned, refunded, or cancelled, any unredeemed credit will be voided, and the value of any redeemed credit will be deducted from the refund. Offer available to residents of the United States and Canada through their respective KITS sites. KITS reserves the right to modify, suspend, or cancel the promotion at any time without notice. Terms of credits already issued will be honoured as above.
Shop glasses Shop sunglasses
X
Shipping you can count on
At ContactsExpress, we're committed to keeping your orders moving, even with potential Canada Post disruptions. We've secured alternative carriers to ensure your eyewear arrives quickly and reliably.
Our priority is minimizing delays and giving you the best shipping experience possible.
If you have any questions, our customer care team is here to help at [email protected] or 1-833-487-5487.
X
$10K Canadian Getaway Giveaway
To show Canadians there's so much more to see, we're giving away a $10,000 getaway anywhere in Canada. One lucky winner will plan their dream vacation with flights, 5-star stays, unforgettable experiences, and a KITS shopping spree.
Every purchase made on PostalContacts.com by October 31 will automatically receive 100 entries. For more ways to win, be sure to check us out on Instagram @kitseyecare.
Giveaway ends October 31, 2025 at 11:59 PM PT. Open to Canadian residents 18+. Prize details and inclusions are set by KITS and may be changed, substituted, or cancelled at any time. No cash value. No purchase necessary. Free entries available on Instagram.

10% OFF* YOUR FIRST CONTACTS ORDER!
Use code: SAVE10

*Discount applied on the current website price at the time of order. Offer only valid for new customer first contacts order over $10. Maximum discount of $100. Cannot be combined with any other offers. Promotions are subject to change without notice. We reserve the right to cancel orders that are in breach of the terms and conditions of this offer.

Close
Subscribe & Save Logo
Save 15%
Increased savings
on future orders
Price-Match Guarantee
On every order
Free Shipping
on all future orders*
Loyalty Rewards
Top tier savings & perks with each reorder
Learn More Close
*See Subscribe & Save page for details, restrictions may apply!
Help
Check order status Place reorder
Resource hub
How to measure your PD at home
Glasses - How to read your prescription Contacts - How to read your prescription Shipping & Returns
Get in touch
Chat with us
1-833-487-5487
(Monday to Friday: 10am-6pm EST)
[email protected]
Leave a video or voice message
The fastest way to connect with our team
Contacts
Eyeglasses
Sunglasses
AI Smart Glasses New
Brands
Insurance
Sign in
My account
Favorites
Use your insurance
Get help
Get help
Check order status
Place reorder
How to measure your PD at home
Glasses - How to read your prescription Contacts - How to read your prescription Shipping & Returns Contact us
Account
Eyeglasses
Shop
All eyeglasses Women Men Kids
Featured
Best Sellers Progressives KITS new arrivals KITS eyeglasses Designer eyeglasses
Get ready for Back to School with up to 50% off kids frames
Shop kids glasses Small Right Arrow
Meet Your Everyday AI Glasses
Shop KITS Pangolin 3 Small Right Arrow
Sunglasses
Shop
All sunglasses Women Men Kids
Featured
Best sellers Polarized KITS sunglasses Designer sunglasses
Get ready for Back to School with up to 50% off kids frames
Shop kids sunglasses Small Right Arrow
Vacation-ready
Shop sun styles Small Right Arrow
AI Smart Glasses
Shop
All AI Smart Glasses KITS Ray-Ban Meta Oakley Meta Nuance Audio Lucyd Armor Reebok
Featured
New
KITS Pangolin 3 Soren
KITS Pangolin 3 Soren
$178
$
KITS Pangolin 3
Discover now Small Right Arrow
Designer frames. Smart technology.
Shop the collection Small Right Arrow
Brands
Top brands
Shop
Brand A-Z Designer eyeglasses Designer sunglasses Designer kids Smart glasses Safety glasses Designer sale up to 70% off
NEW designer kids collection
Shop up to 50% off Small Right Arrow
Shop NEW Ray-Ban Meta
With 30% off lensesSmall Right Arrow
Sale
Up to 65% off selected KITS Frames
Shop KITS sale Small Right Arrow
Designer sale up to 70% off
Shop Designer sale Small Right Arrow
Readers
Shop
Readers Progressive readers New
See near and far with one pair
Progressive readers seamlessly transition from no magnification at the top to your reading strength at the bottom, so you can move naturally throughout your day without ever taking your glasses off. One pair, no visible lines, no prescription needed.
Shop Progressive Readers Small Right Arrow
Contacts
Featured
Shop
All contacts Daily Weekly Monthly Toric Multifocal Color
Contacts starting at $1 a day
Shop KITS Daily Small Right Arrow
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