Selling spectacles online: how buyers handle the prescription, frame size and trying on

A buyer has a frame in her cart and stops at the box that says "Upload prescription". Then she closes the tab. She is not sure the slip from her eye clinic will make sense to you, she cannot tell whether the frame will fit her face, and nothing on the page says who checks the lenses. Selling spectacles online works when each of those three moments has an answer: a prescription form that is hard to misread, frame sizes she can compare with her own pair, and a named check before dispatch.

How should the prescription reach you?

A prescription slip is written by hand or printed, in whatever layout the clinic uses. The eyes may be labelled RE and LE, or OD and OS. Each eye has a sphere, perhaps a cylinder and an axis, and for reading or progressive lenses an addition. The same lens can be written two ways, with the cylinder as a plus or a minus figure, and the lab needs to know which one it is reading.

A single free-text box invites every mistake on that list. Values arrive on one line, the eyes get swapped, an axis turns up without a cylinder. Build the form so the mistakes cannot be typed:

• one block per eye, under a small drawing of a face so "right" means the buyer's right;
• sphere and cylinder chosen from a list in standard steps, not typed;
• the axis box opens only when a cylinder has been entered;
• the addition box appears only for reading or progressive lenses;
• a photograph of the slip, and the date written on it, both required.

The photograph is the record. The typed values are what the lab reads. Someone has to compare the two, which is the check further down. Who may test eyes, write a prescription and dispense against one is set by rules that differ by state and professional body and change, so check with your own adviser or the regulator before the form goes live.

Pupillary distance and progressive fitting heights are a separate problem. An optical shop with a website sets out which orders a website can take whole and which need the buyer in a chair.

Frame size: give her numbers, not "medium"

"Medium" means something different at every brand. The numbers do not. Put this on the size guide, in plain words:

Find your current glasses. On the inside of one arm are three numbers, such as 52 18 140. The first is the width of each lens in millimetres, the second the bridge between the lenses, the third the length of the arm. A frame within a couple of millimetres of your lens width and bridge will sit much as your current pair does.

Then show those three numbers on every frame page, with the total front width and the weight in grams, and let buyers filter by lens width. Weight matters to high-power wearers, whose lenses are thicker and heavier in a large frame.

The nose is the other half of fit. Buyers whose glasses keep sliding down want to know which frames have adjustable nose pads or a low-bridge fit. Say so on the page, in those words.

Trying on without a mirror

Camera try-on shows style and colour against the buyer's face. It does not show whether the frame grips at the temples or rests on the cheeks. Photographs of each frame on two real faces, one narrow and one wide, add what the camera cannot. Neither replaces the numbers.

Lenses are cut for one buyer and cannot be sold again, so the return rule needs to say plainly what comes back and what does not. A frame-only order, returnable if it does not suit, lets a nervous buyer try the shape before paying for lenses. So the return rule belongs on the product page, where a buyer reads it before she reaches payment, not in a policy link in the footer.

The check before the parcel leaves

This is the part buyers cannot see and worry about most. Write it down as a flow, name who does each step, and tell the buyer it exists.

1. The order system checks the form is complete: both eyes, the date and the photograph.
2. A person qualified to check prescriptions under the rules that apply to you compares the typed values with the photograph. Anything odd, such as swapped eyes or an addition on a single vision order, goes back to the buyer on WhatsApp before the lab sees it.
3. The lab receives the values exactly as checked, with the frame's measurements.
4. The checker reads the finished lenses on a lensometer and compares them with the order.
5. The fitter mounts the lenses, aligns the frame, tightens the screws and sets the nose pads.
6. The checker signs a card for the box with the values checked and a name.
7. Customer service messages the buyer after delivery to ask whether the glasses feel right.

A signed card in the box says more than a badge on the home page, because it names a person. If you have no shop for adjustments, a nearby optician who will adjust frames bought from you gives the buyer somewhere to go.

For example: an online-only seller in Hyderabad

Imagine an online-only eyewear seller in Hyderabad with a free-text prescription box. A buyer typed her values with the eyes in the order of her slip, which used OD and OS. The lab read them the other way round. Nobody compared the typed values with her photograph, because nobody's job was to. The lenses were made with the eyes swapped. She said the glasses felt wrong, the remake ate the margin, and her review was about the website, not the frame.

The fix was the form above, a mandatory photograph, step 2 of the flow and the signed card. The remake cost her the margin on that pair. The business and the figures are invented; the mistake is one any free-text form allows.

Limits, and what to leave off the page

If you cannot staff a qualified check, sell frames and sunglasses and send prescription orders to an optician who can. Keep children's glasses and first progressives for a fitting in person. Leave out any line suggesting an online order replaces an eye test, and any promise about how quickly lenses will arrive that your lab cannot keep.

What to do next

Print your current prescription form and fill it in wrongly on purpose, swapping the eyes and leaving the axis out. Every mistake you can make, a buyer will. Fix the form, then write the check flow on one page with a name against each step. Selling lenses is a hard case within e-commerce sales and marketing, and if the gaps are bigger than a form can close, tell us what you need.