A 26-year-old with headaches, blurred near vision, and a strong family history of glaucoma
A 26-year-old woman presents with frontal headaches and blurred near vision that worsen through the day and are worse when reading. She is a postgraduate student who works 10 hours a day on a laptop. She is myopic and wears −4.00 DS in each eye, which she says are two years old. She has a family history of glaucoma in her father. Unaided acuity is 6/60 in each eye, corrected to 6/6. Near point of accommodation is 18 cm in each eye; near point of convergence is 8 cm. Cover testing is orthophoric at distance and near. IOP is 15 mmHg in both eyes, and the optic discs appear healthy with a cup-to-disc ratio of 0.4 and no asymmetry. She asks whether she needs a stronger prescription or whether the headaches are from screen use.
1. What is the likely cause of her symptoms, and how do you distinguish it from refractive under-correction?
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Likely cause: accommodative or convergence-related asthenopia, with a possible small under-correction.
Analysis of the findings:
- Headaches and blurred near vision worse through the day and with reading - the classic pattern of accommodative fatigue. Symptoms that build with sustained near work point to a functional binocular or accommodative problem rather than a fixed refractive error.
- Near point of accommodation 18 cm - for a 26-year-old, the expected amplitude is roughly 10 D or more (near point around 10 cm or closer). An 18 cm near point corresponds to about 5.6 D of amplitude, which is reduced for her age. This suggests accommodative insufficiency or fatigue.
- NPC 8 cm - within normal limits, so convergence insufficiency is less likely to be the primary problem.
- Orthophoria at distance and near - no significant heterophoria to explain symptoms.
- Two-year-old spectacles - a small under-correction, especially if myopia has progressed, would add to accommodative demand and could contribute.
Distinguishing from refractive under-correction:
- Perform a full cycloplegic or careful subjective refraction and compare with the current prescription. If the change is small (e.g. 0.25–0.50 D), it is unlikely to explain the symptoms alone.
- Measure accommodative amplitude and facility (e.g. ±2.00 D flipper test) before and after sustained near work. A large drop after a reading task supports accommodative fatigue.
- Ask about symptom timing - refractive under-correction tends to cause constant blur, whereas accommodative fatigue worsens with sustained near work.
Other considerations: screen-related dry eye is a common contributor and should be assessed.
2. How do you manage her, and how does the family history of glaucoma affect your plan?
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Management:
- Refraction - perform a full refraction. If there is a meaningful change, update the prescription. Do not over-minus to "rest" accommodation; that risks inducing more strain.
- Accommodative therapy - if accommodative insufficiency is confirmed, a structured programme of accommodative facility exercises (flipper training) and near-far focusing drills is effective, with review in 4–6 weeks.
- Ergonomic advice - 20-20-20 rule, screen distance and height, regular breaks, blinking awareness, and management of dry eye with lubricants if symptomatic.
- Explain the diagnosis - she should understand that this is a functional problem that responds to training, not a disease, and that her symptoms should improve.
- Review - assess symptom change, repeat accommodative amplitude and facility, and adjust.
How the family history affects the plan:
- A first-degree relative with glaucoma is a significant risk factor. Her IOP is normal and discs are healthy, but this does not exclude glaucoma.
- Baseline documentation - record optic disc appearance, cup-to-disc ratio, and consider a baseline visual field and optic nerve imaging if available, so future change can be detected.
- Do not over-investigate at 26 - the yield of extensive glaucoma workup in a young patient with normal findings is low; the priority is a documented baseline and appropriate review interval.
- Review interval - annual or biennial review with IOP, disc assessment, and fields, rather than discharging her.
- Counselling - explain the family history and the importance of regular checks, and that her current symptoms are not glaucoma-related.
Exam point: the judgement call is separating a benign functional diagnosis from an anxiety-driven glaucoma workup, while still respecting the genuine risk factor.