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How to read your glasses prescription

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How to enter your glasses prescription

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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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The code is a child of mathematics and commerce. Its structure—grouped in five blocks of five characters—is not accidental. This format balances machine readability with human usability. The hyphens act as visual anchors, breaking an otherwise intimidating string into digestible chunks, much as commas break a long sentence. This is a language designed for error resistance; a single mistyped letter can mean the difference between validation and rejection. In this way, the code mirrors the unforgiving precision of the computers it serves. It demands our obedience, not its own flexibility.

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In the end, a string like pbtfm-wwn3h-2gd9x-vjrmg-c9vt is more than a random sequence. It is a tiny poem of the digital condition: precise, impersonal, and powerful. It reminds us that in a world of infinite reproducibility, access is still controlled by finite, knowable secrets. We may not see the lock, but the key is right there—twenty-five characters that separate the outsider from the insider, the void from the door. The hyphens act as visual anchors, breaking an

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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 .
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$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 Kits.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!
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*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.

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Increased savings
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Price-Match Guarantee
On every order
pbtfm-wwn3h-2gd9x-vjrmg-c9vt
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on all future orders
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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.
pbtfm-wwn3h-2gd9x-vjrmg-c9vt
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

Get your perfect fitting Glasses

Buying eyewear should leave you happy and good-looking. Use our sizing tool to find frames that best fit your unique facial measurements.

PD Measurement

PD, or Pupillary Distance, is the distance between your pupils. It's a crucial measurement for ensuring the perfect fit of your glasses. Measuring your PD is now easier than ever with our new camera-based PD measurement tool.

Camera-Based PD Measurement

Our camera-based PD measurement tool utilizes the camera on your mobile device or computer to provide you with an instant and precise measurement. For the most accurate results, we recommend using an iPhone, as it takes advantage of the depth-sensor in the front-facing camera.

1. Click "START NOW" below.
2. Grant camera access if prompted.
3. Follow the on-screen instructions to position your face correctly.
4. Get your instant and precise PD measurement.


We've designed this tool to be quick, user-friendly, and highly accurate, ensuring you have the most precise PD measurement for ordering your glasses.

Don't have a camera-enabled device? No worries! We also offer a print and measure method for obtaining your PD. Click on the download link below to get started.

At Kits, we're dedicated to providing you with a seamless and customer-focused eyewear experience. With our easy-to-use PD measurement tools, you can confidently order glasses that fit you perfectly.

Let's get started on your journey to impeccable vision! Choose your preferred method below:

1. Use Our Online PD Measurement Tool

Grab a regular card with a magnetic stripe on the back. Student IDs, credit cards and gift cards work well to start our online PD tool.

2. Use Our Paper PD Measurement Tool

You may have received our paper PD measurement tool in your recent online order. In order to use this tool, place the ruler on your eyes so that the "0" lines up at the centre in between your eyes. Add up the two numbers, to get your PD. See example below:

pbtfm-wwn3h-2gd9x-vjrmg-c9vt

3. Download and Print Your Own PD Measurement Tool

Click on this link to download and print your own PD measurement tool.

DOWNLOAD