How Do Prescription Lenses Work?
Prescription lenses correct your vision by bending light so it focuses properly on your retina. The specific curve and thickness of the lens depend on your unique prescription.
There are three main types of vision correction. If you're nearsighted (myopia), distant objects appear blurry — your lenses are thinner at the centre and thicker at the edges, redirecting light forward. If you're farsighted (hyperopia), close-up tasks like reading are the challenge — your lenses are thicker at the centre to push the focal point back. And if you have astigmatism, an irregularly shaped cornea causes blurred or distorted vision at all distances — a cylindrical correction in the lens compensates for that uneven curvature.
Your optometrist measures all of this during an eye exam and writes it into your prescription.
Are Eyewear Prescriptions Standardized?
Yes! Eyewear prescriptions follow a standardized format, so you can use yours at any eyewear retailer. Your prescription includes values for each eye — sphere (SPH), cylinder (CYL), and axis — along with your pupillary distance (PD). Not sure what those numbers mean? Our guide to reading your prescription breaks it all down in plain language.
What Is a Lens Index?
The lens index refers to how efficiently a lens bends light. A higher index means a thinner, lighter lens — which matters most if you have a strong prescription. Here's a quick breakdown:
- 1.50 (standard) — Great for mild prescriptions. Affordable and reliable.
- 1.59 (polycarbonate) — Impact-resistant and lightweight. A solid choice for active lifestyles or kids' glasses.
- 1.61 (mid-index) — Noticeably thinner than standard. Works well for moderate prescriptions.
- 1.67 (high-index) — Significantly thinner and lighter. Ideal if your prescription is on the stronger side.
- 1.74 (ultra-thin) — The thinnest option available. Best for very strong prescriptions where comfort and aesthetics matter.
If you're not sure which index is right for you, your lens thickness page can help you compare.
How Does Lens Axis Impact My Prescription?
If you have astigmatism, your prescription includes a cylinder (CYL) value and an axis number between 1 and 180 degrees. The axis tells your lens maker exactly where to position the cylindrical correction so it lines up with the unique shape of your cornea. Even a small shift in axis can affect how clearly you see — which is why it's important to have an accurate, up-to-date prescription. You can learn more about what CYL on your prescription means in our beginner's guide.
What Is the Difference Between Single Vision and Progressive Lenses?
Think of it this way: single vision lenses correct one field of vision. They're either set for distance (driving, watching TV) or for near tasks (reading, scrolling on your phone) — but not both at the same time.
Progressive lenses, on the other hand, combine multiple corrections into a single lens with no visible line. The top of the lens handles distance, the middle covers intermediate tasks like working on a computer, and the bottom is for close-up reading. Most people start needing progressives around their 40s, when age-related presbyopia makes it harder to shift focus between near and far.
We offer both options — explore our lens options to find the right fit for your lifestyle.
What Lens Coatings and Add-Ons Should I Consider?
Once you've picked your lenses and frames, coatings are where you can really customize the experience. Here are the most popular options:
- Anti-reflective coating — Cuts glare from screens and headlights, making your lenses clearer and more comfortable for long days at the computer or nighttime driving.
- Blue light filter — Helps reduce exposure to blue light from digital screens. We offer this as an add-on across our lens options.
- UV-reactive lenses — These lenses darken in sunlight and return to clear indoors, so you get prescription eyeglasses and sunglasses in one.
- Scratch-resistant coating — Adds a protective layer to help your lenses hold up to everyday wear and tear.
You can browse our lens options to see what's available for your frames.
Can You Reuse Old Lenses in New Frames?
In some cases, yes — if your lenses are still in good shape and the new frames are compatible in size. Our team can assess whether a lens swap is possible. The best way to find out is to visit one of our locations and bring your current glasses along. Check out our in-store lens replacement service for details.
Does Your Prescription Affect Which Frames You Should Choose?
Absolutely — and not just for comfort. Your prescription can influence which frames look and feel best on you. Here's what to keep in mind:
Lens index and frame size. A stronger prescription means thicker lenses, especially at the edges. Choosing smaller or rounder frames can minimize that thickness. If you prefer oversized styles, splurging on extra thin lenses is worth considering.
Frame material. Heavier prescriptions pair well with sturdy acetate frames that can support thicker lenses without flexing. Lightweight metal frames work beautifully for milder prescriptions and a more minimal look.
Eye position. For optimal clarity, your eyes should be centred in the lens — not sitting too high, too low, or too close to the edge.
Face shape. Certain frame styles naturally complement different face shapes — round, oval, square, or heart. If you're not sure where to start, our find your frame style guide can help you narrow it down.
Try before you buy. Our virtual try-on tool lets you see how different frames look on your face from the comfort of your couch. It's the easiest way to test styles before committing — especially when you're factoring in how your lenses will sit in the frame.
How Long Does It Take to Get Prescription Glasses Made?
Once your prescription is confirmed, we cut and shape your lenses to match your exact measurements and fit them precisely into your chosen frames. We carefully quality-check every pair before it ships.
We'll keep you updated every step of the way — and once your glasses are on their way, you'll receive tracking so you know exactly when to expect them. Turnaround times vary depending on your lens type and any coatings you've selected, so progressive lenses and specialized add-ons may take a bit longer.
Want to pass the time while you wait? Check out some fascinating eye facts you probably didn't know.
How Do I Order Prescription Glasses Online?
Ordering prescription glasses online is easier than you might think. Here's how it works:
- Get an up-to-date prescription. Visit your optometrist for a current eye exam — most prescriptions are valid for one to two years. Need to find one nearby? You can book an eye exam through our locator.
- Know your pupillary distance (PD). This is the distance between the centres of your pupils, measured in millimetres. Your optometrist can provide it, or you can measure it at home with a ruler and a mirror.
- Choose your frames. Browse by style, shape, colour, or material. Use our virtual try-on tool to see how frames look on your face before you decide.
- Select your lens type and coatings. Pick from single vision or progressive lenses, then add coatings like blue light filter or anti-reflective for extra comfort.
- Place your order. Enjoy free shipping on orders over $80 and free returns within 30 days — so there's no risk in trying something new.
Ready to start? Shop eyeglasses and find your perfect pair.
