Spectacle prescriptions patients and opticians can actually read

In 2012 a team in Chandigarh checked the spectacles that 200 young patients, aged 1 to 26, had been given after an eye examination. In one group, 32 percent of the glasses did not match the prescription closely enough. In another group, where parents had been told simply to ask the optician to check the glasses against the prescription when collecting them, that fell to 15 percent. In 3 percent of each group, the right and left lenses had been swapped.

The study looked only at how the glasses were made from the prescription. The problems happened after the patient left the clinic, somewhere between the paper and the optician's workbench.

That is the gap this post is about. Much of it can be closed by the way the prescription is written and handed over.

The prescription travels further than you think

Many patients buy their glasses somewhere other than where they were examined: the optician near home, a chain store in the mall, or an app on their phone. And a prescription often outlives the visit by years.

Whoever reads it next did not see the patient, cannot ask you what you meant, and in many shops has no formal training in dispensing. A trade magazine for the optical industry in India put it plainly: there are, so far, no rules here on how closely a pair of glasses must match the prescription.

So the prescription has to carry everything on its own.

When it goes wrong, it reaches the patient

In June 2024 a consumer commission in New Delhi ordered an eye centre to pay compensation after a patient who needed plus lenses was given a prescription for minus lenses. The eye test had been done by someone without proper training. Wrong glasses are not a small inconvenience to the patient. Headaches, a fall on the stairs, a child who cannot see the board.

Handwriting adds to the risk. An audit of general prescriptions at a hospital in Mandya, Karnataka, found 11 percent illegible and another 20 percent barely legible. A spectacle prescription is mostly numbers and signs, where one smudged minus or a 9 that looks like a 4 changes the lens completely.

What a complete spectacle prescription carries

We could not find an Indian standard that lists the contents of a spectacle prescription. Rules abroad, such as Oregon's in the United States, cover most of this list, and the rest is good practice:

• The patient's name and the date of the examination
• Right eye and left eye, each clearly labelled, in words as well as RE and LE
• Sphere, cylinder and axis for each eye, with a plus or minus sign every time
• The near addition, if any, and whether it is for reading or intermediate distance
• Pupillary distance
• Prism, if prescribed
• The lens type: single vision, bifocal or progressive, and any recommended coating
• When the patient should come back for review
• The doctor's name, registration number and signature

Doctors already put their registration number on prescriptions. Clause 1.4.1 of the Medical Council's 2002 regulations asks for it, and a spectacle prescription is no different.

Small habits that prevent wrong glasses

1. Print it. A typed prescription removes the handwriting problem in one step.
2. Write the sign every time. Write +0.50 or -0.50, never just 0.50. Write plano in words when there is no power.
3. Write the axis in three digits. 090 is hard to misread. 90 next to a stray mark is not.
4. Right eye first, left eye second. Label each, and use the same layout on every prescription from your hospital, so opticians who see your slips regularly know where to look.
5. One prescription, one purpose. If the patient needs separate glasses for distance and for the computer, say so clearly rather than leaving the optician to work it out.
6. Tell the patient to have it checked. Ask them to have the optician check the new glasses against the prescription when collecting them. In the Chandigarh study, 15 percent of the glasses had errors when patients were told to ask for this check, against 32 percent of the others.
7. Give them a copy that lasts. A clean printed copy, or a digital one, that will still be readable when they need new glasses next year.

None of this takes extra time once it is how your prescriptions are made. And the patient who gets the right glasses the first time remembers your hospital for it.

Sources

• Mohan and Sharma, accuracy of spectacles dispensed to children, Indian Journal of Ophthalmology, 2012. Article
• Prescription legibility audit, Mandya, International Journal of Research in Medical Sciences. Article
• Oregon Administrative Rules 852-020-0029, contents of a spectacle prescription. Rule
• Indian Medical Council (Professional Conduct, Etiquette and Ethics) Regulations, 2002, clause 1.4.1. NMC PDF