Dilating a hyperopic patient with a history of brow pain at a cataract camp
A 62-year-old woman attends a district eye camp for cataract assessment. Her refraction is +4.25 DS in both eyes and the anterior chamber is visibly shallow on oblique torch examination. She is listed for biometry and asks to be dilated "like last time". On questioning she reports that three years ago, about six hours after dilating drops at another hospital, she had severe brow pain, coloured halos and blurring that lasted two days and was treated with tablets and drops. She has no records of gonioscopy. The only mydriatic in the camp box is tropicamide 0.5%, with no pilocarpine and no anaesthetic standby; the ophthalmologist is scheduled to arrive in three hours and is currently operating at the base hospital. The camp coordinator tells you to dilate everyone on the list quickly so the doctor can examine them all in one sitting.
1. What is the specific risk in dilating this patient, and how do you handle the coordinator's instruction in the moment?
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The risk is not generic 'dilation risk' - it is a probable past attack of acute angle-closure glaucoma. The features stack up: hyperopia of +4.25 D (short eye, crowded angle), a visibly shallow anterior chamber, age over 60, and a documented episode of brow pain with coloured halos and blurring starting hours after dilation and lasting two days. That is the classic timing and symptom pattern of a pressure rise after mydriasis. Tropicamide alone can repeat it.
Why the setting makes it worse: the camp has no tonometer, no slit lamp, no pilocarpine and no doctor for three hours. If she closes her angle here, nobody will measure the pressure, nobody can treat it, and the sight loss may be permanent by the time she reaches the base hospital.
What I do: I do not instil the drop. I explain the reason to the coordinator in consequences, not rules - "she has had a pressure attack before; dilating her without a doctor here to check the angle risks losing the eye". Then I offer a workaround that keeps the list moving: dilate the low-risk patients now, flag her file "do not dilate - query narrow angle", and get the ophthalmologist's decision by phone or message so the record shows the decision was the doctor's. If the coordinator insists, I escalate and document the exchange rather than complying.
2. How should the rest of her cataract work-up be reorganised so she is not simply sent home untested?
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Most of the work-up does not need a dilated pupil, so she can still be assessed today.
- Biometry: optical (partial coherence) biometry is done through the undilated pupil and does not require mydriasis. It can proceed now, with the axial length interpreted knowing she is a high hyperope (short axial length - check the reading against the refraction; an improbably long axial length in a +4.25 D eye suggests a fixation error).
- Refraction and acuity: record presenting and best-corrected acuity, retinoscopy if the doctor is available, and document the shallow chamber finding in words a colleague can picture.
- Angle assessment: gonioscopy is the test that actually answers the question, and it needs a slit lamp and an ophthalmologist. She must be referred for this, with the history of the previous episode written on the referral.
- Fundus: if a dilated fundus view is genuinely needed (for example to exclude diabetic retinopathy before surgery), the decision and the precautions belong to the ophthalmologist at the base hospital, where pilocarpine prophylaxis, tonometry and same-day pressure checks are possible. Prophylactic pilocarpine is a doctor's order, not a technician's improvisation.
- Counselling: tell her the drops used elsewhere caused a reaction and that a specialist must check the drainage angle before any dilation. Give her the warning symptoms - severe eye or brow pain, halos, nausea, vomiting, sudden blurring - and a named place to go immediately, day or night.
3. What must be written in the record and in the camp register, and what should you avoid saying to the patient?
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In the clinical record:
- The refraction (+4.25 DS both eyes) and the torch finding of a shallow anterior chamber.
- The verbatim history of the 2021-style episode - onset about six hours after drops, brow pain, halos, blurring, two days' duration, treatment given - and that no gonioscopy report is available.
- The decision: dilation withheld, who was informed, when, by what route, and the reply.
- The revised plan: biometry done undilated, referred for gonioscopy and pressure check, follow-up date.
- Any counselling given on warning signs, and that the patient repeated them back (or that she was accompanied by a relative who understood).
In the camp register: a flag next to her name so that a different technician at a future camp does not dilate her by default. Registers are the memory of a camp, and a red flag in a register is what prevents a repeat.
What I must not say: I must not tell her "you have glaucoma" or "you will go blind" - I have not measured her pressure or seen her angle, and that is the doctor's diagnosis to make. The safe wording is factual and non-alarming: "the drops used before caused a reaction in your eye; before any more drops, the doctor must check the drainage angle, so we are doing the measurements that don't need drops today." I also should not promise that surgery is cancelled - only that today's tests are being rearranged.