Buying Your Child’s Glasses Online vs. at an Optical Shop
The Short Answer for Busy Parents
Yes, you can order your child's glasses from an online retailer, and it is often cheaper and more convenient than a shop. But 'buying online' only covers the glasses themselves. Every corrective eyewear prescription must be approved by an optometrist or ophthalmologist, and online vision tests are not recommended for anyone under 18 years of age.1 So the exam still happens in person, and only the frames and lenses are bought online.
A child's eye exam does more than measure how strong the lenses should be. A comprehensive eye exam can detect common eye diseases and conditions that have few or no symptoms, which online vision tests cannot find because they only measure the power of a prescription.1 For young children, that in-person check is where problems like a lazy eye or a large focusing difference between the two eyes get caught early, while they are most treatable.
Below we compare ordering online against buying at a local or pediatric optical shop, walk you through measuring your child's pupillary distance (PD) at home, and flag the signs that a new pair is not fitting right. The goal is glasses your child will actually keep on their face.
The Two Ways to Get Your Child's Glasses
Online retailers let you upload your child's prescription, pick frames, and enter the measurements needed to center the lenses. Prices are usually lower and the selection is large. The trade-off is that you become the 'optician': you supply the pupillary distance, judge the frame size from a screen, and adjust the fit yourself when the package arrives. Online vision-testing services may not offer prescriptions for people with high-power or irregular prescriptions, so a child with a strong or unusual correction still needs a full in-person refraction.1
A shop, especially one that fits children often, measures the PD for you, helps pick a frame scaled to a small face, and adjusts the temples and nose pads on the spot. Glasses must fit well so that they are comfortable and give clear vision, with the eyes centered in the lenses and the frame not touching the cheeks or eyelashes.2 That hands-on fitting is the main thing you trade away when you order online.
Whether you buy online or in a shop, the prescription itself comes from a licensed eye doctor after an exam. Because online vision tests are not recommended for anyone under 18 and cannot find eye diseases that often have hidden symptoms, a child's prescription belongs to an in-person exam rather than an online test.1 Ask for a copy of the written prescription at the visit; you are entitled to it, and you will need it either way.
Online vs. Optical Shop, Side by Side
| What matters | Ordering online | Optical shop |
|---|---|---|
| Who measures the PD | You, at home | The optician |
| Frame fitting and adjustments | You do it, or mail it back | Done in person, often free |
| Lens material for kids | You must choose it | Staff steer you to it |
| Typical cost | Usually lower | Usually higher |
Polycarbonate (shatter-resistant) lenses are the only type that should be prescribed for children unless the ophthalmologist says otherwise, so make sure any online order specifies them.2 A shop will almost always default to this material; online, it is a box you have to check.
Pupillary distance is the space between the centers of the two pupils, in millimeters, and it is used to center each lens in front of the eye. To measure it at home you need a millimeter ruler: line the ruler's zero mark up with the center of one pupil and read the millimeter mark that falls at the center of the other pupil.3 With a child, have them look at a distant object over your shoulder and ask a second adult to hold the ruler steady, or take a photo with a ruler held to the brow and measure from the still image.
Ordering online tends to suit an older child with a mild, stable prescription and a face big enough for standard sizes, where saving money and reordering a familiar frame matter most. A shop tends to suit a toddler, a first pair, a strong or changing prescription, or a child hard on their glasses, where professional fitting and quick repairs earn their higher price. Many families do both: fit the first pair in a shop, reorder the same frame online later.
What Can Go Wrong, and the Realistic Outlook
The two common online mistakes are an off PD and a frame that is too big. The accuracy of at-home rulers and apps for measuring PD can vary, and professional measurement by an eye care specialist is the most accurate.3 A PD that is off shifts the optical center away from the pupil, which can blur vision or cause eye strain; the fix is to remeasure carefully, or have the shop check it, before reordering. It is a nuisance, not a danger, and it is fully correctable.
A child's pupillary distance changes as the eyes grow during childhood and usually stays the same only once they are an adult and done developing.3 Because the number keeps moving while a child grows, it is worth taking a fresh PD with each new prescription rather than reusing one from an old pair, and a shop fitting redoes it each time at no extra effort on your part.
The best-priced pair is worthless if it sits in a backpack. Some children need straps or temple tips, sometimes called ear grips or 'stay-puts,' to keep glasses in place, and for infants the cable behind the ear must not be too tight.2 Whether you buy online or in person, budget for these small add-ons and check comfort daily during the first week.
When to Call the Eye Doctor
Call the prescribing eye doctor the same day if your child, after a short adjustment period, has new headaches, double vision, worsening eye turn, or refuses the glasses outright, or if one eye seems to be doing all the work. These can mean the prescription or the PD is off, or that an eye problem needs another look. An online test can measure a prescription but cannot detect eye diseases that often have hidden symptoms, so persistent trouble deserves an in-person exam.1 Most of the time the fix is a simple adjustment or remeasure.
Keep your child's regular eye exams on schedule even when the glasses seem fine, because a growing child's prescription and PD both change. Bring the current glasses to every visit so the doctor can check the fit and the lens centering against the new measurements.
Prescriptions and routine fitting come from your optometrist or ophthalmologist. For frame fitting, look for optical shops that work with children often, since sizing a small face is different from fitting an adult.2 A pediatric eye specialist is the right call if there is a suspected lazy eye, eye turn, or a large difference between the two eyes.
Common Questions From Parents
Yes. Online retailers sell frames and lenses, not exams. Every corrective eyewear prescription must be approved by an optometrist or ophthalmologist, and online vision tests are not recommended for anyone under 18.1 Book an in-person exam, get the written prescription, then order online if you like. An outdated prescription is the most common reason online glasses come back wrong, so use a current one.
Accurate enough that the lens centers sit in front of the pupils. At-home PD measurements can vary in accuracy, and an eye care professional's measurement is the most reliable.3 If you are measuring at home, do it two or three times and average the readings, and ask a second adult to help hold the ruler for a squirmy child. When in doubt, have a shop confirm the number.
They can be, if you order the right material. Polycarbonate lenses are the only type that should be prescribed for children unless the ophthalmologist advises otherwise, because they resist shattering.2 Reputable online sellers offer polycarbonate, often as the default for kids, but check the box yourself. Price does not have to mean unsafe; the lens material and a correct prescription matter far more than where you buy.
Be cautious. Online vision-testing services may not handle high-power or irregular prescriptions well, so a strong correction is better fitted in person.1 A high prescription also fits best in a smaller, rounder frame and is more sensitive to PD errors, both of which a shop manages more easily. If you do order online, start from a written prescription and PD taken by the eye doctor.
Better not to. Pupillary distance keeps shifting while a child's eyes are still growing and settles only once they reach adulthood.3 Reusing an old number can leave the lenses slightly off-center. Ask for a fresh PD at the exam, or remeasure at home right before you order.
More Questions About Kids' Glasses
Minor slipping is normal at first and usually fixable. Glasses should sit with the eyes centered in the lenses and the frame clear of the cheeks and eyelashes, and straps or ear grips can hold them in place.2 A local optical shop can often adjust an online pair for a small fee. If the frame is simply too large for your child's face, return it and size down rather than forcing the fit.
No. Online tests are not recommended for people under 18 and cannot detect eye diseases that often have no early symptoms.1 Children need in-person exams to catch focusing problems, eye turns, and lazy eye during the years these are most treatable. Use online ordering for the glasses, never as a substitute for the exam itself.
- Can I have a written copy of the prescription, including the PD, to order glasses myself?
- Is my child's prescription strong or irregular enough that I should have the glasses fitted in person?
- Which lens material do you recommend, and should it be polycarbonate?
- How often should we re-check the prescription and PD as my child grows?
- Are there signs of a lazy eye or eye turn I should watch for at home?
- American Academy of Ophthalmology (EyeSmart) (2023). Getting a Glasses Prescription Online: What You Should Know.
- American Association for Pediatric Ophthalmology and Strabismus (AAPOS) (2023). Glasses Fitting for Children.
- Cleveland Clinic (2023). Pupillary Distance (PD): What It Is & How To Measure.