How to Buy Glasses Online: A Step-by-Step Guide

Updated

You can buy glasses online in five steps: get your prescription and pupillary distance (PD), pick a frame that matches your face and lens needs, choose lens add-ons, confirm insurance and return terms, then check the final total before paying. Target Optical, for example, lists prescription lenses at 40% off with free shipping on all orders, so the main work is on your side: accurate measurements, the right frame fit, and knowing what your insurance actually covers.

Step 1: Gather your prescription and PD before you shop

Online checkout will ask for two numbers that are not the same thing:

  • Prescription — sphere (SPH), cylinder (CYL), axis, and sometimes prism, for each eye. You get this from an eye exam. In the US, an optometrist must give you a copy after the exam.
  • PD (pupillary distance) — the distance in millimeters between your pupils. It tells the lab where to center the lenses. A wrong PD is the most common cause of "these glasses give me a headache."

If your prescription doesn't list PD, ask the optical shop where you had the exam to measure it, or use a virtual PD tool if the retailer offers one. Prescriptions also expire — typically one to two years — so check the date before you order.

Step 2: Choose a frame size and shape that fits

Frame measurements are printed on the inside of the temple arm as three numbers, like 52-18-145:

Number Meaning What it affects
52 Lens width (mm) Overall lens size
18 Bridge width (mm) How it sits on your nose
145 Temple length (mm) Reach to your ear

The fastest way to get this right: find a pair you already own and like, read those three numbers, and filter the online catalog by the same range. Face shape matters less than fit — a frame that's too narrow pinches, and one that's too wide slides down.

Most sites offer virtual try-on using your phone or webcam. Use it to judge width and shape, but treat it as a rough guide, not a measurement tool.

Step 3: Pick lens add-ons deliberately

The frame price is rarely the final price. Lens options stack up:

  • Single vision vs. progressive — progressive lenses cost more and need an accurate PD and fitting height.
  • Anti-reflective coating — reduces glare and reflections; usually worth it if you drive at night or work at a screen.
  • Blue light filtering — marketed for screen use. Evidence for eye-strain relief is mixed, so treat it as a comfort preference, not a necessity.
  • Photochromic (light-adapting) lenses — darken outdoors. Convenient, but they don't fully replace sunglasses in a car.
  • High-index lenses — thinner and lighter for stronger prescriptions. If your SPH is above roughly ±3.00, this is usually worth considering.

Each add-on changes the total, so add them one at a time and watch the price update.

Step 4: Check insurance, HSA/FSA, and return policy

Before checkout, confirm three things:

  1. Insurance — many vision plans let you use out-of-network benefits online. You typically pay upfront and submit a claim for reimbursement, or the retailer may file for you. Ask which applies.
  2. HSA/FSA eligibility — prescription glasses and contact lenses are generally eligible medical expenses in the US. Keep your itemized receipt.
  3. Returns and warranty — look for the return window, whether it covers prescription lenses (not just frames), and who pays return shipping. A 30-day return window is common; some retailers charge a restocking or lens fee.

Step 5: Verify shipping and the final total

Before you pay, check:

  • Production + shipping time — prescription lenses usually add several days to the frame's ship time. If you need glasses by a date, order early.
  • Final total — frame + lenses + coatings + tax + shipping. Target Optical states free shipping on all orders, but confirm this at checkout for your location.
  • What's in the box — case, cloth, and whether adjustments at a local store are included.

Common mistakes to avoid

  • Ordering without a current PD — the single biggest source of returns.
  • Assuming the frame price is the total — lens add-ons often cost more than the frame.
  • Skipping the return policy — prescription lenses are harder to return than frames.
  • Ignoring prescription expiry — an expired Rx may be rejected at checkout.

If you have your prescription and PD in hand, buying glasses online is mostly a matter of matching frame measurements, choosing only the lens options you'll actually use, and confirming the return terms before you pay.