History Taking · Foundation · Ophthalmology

Gradual Vision Dimming

Practise this PLAB 2 history taking station on Age-Related Cataracts. 8-minute voice AI simulation with feedback on all 3 marking domains.

Clinical scenario

You are an FY2 doctor in primary care. Mrs Nancy Goddard, a 76-year-old woman, has attended for routine blood pressure review. She mentions that her vision has gradually become dimmer and blurrier, particularly affecting one eye more than the other, over the past 2 years. Please take a focused history and discuss management options including surgical referral.

Background notes: PMH: Hypertension, Osteoporosis, Hypercholesterolaemia, Hypothyroidism, Cataracts developing

What this station tests

  • Glare sensitivity as a classic cataract symptom: difficulty with oncoming headlights, needing brighter light to read
  • Functional impact assessment driving the referral decision: night driving abandoned, reading difficulty, falls risk in someone living alone
  • Distinguishing cataracts from glaucoma (peripheral field loss) and macular degeneration (central distortion)
  • Explaining cataract surgery briefly: day case, local anaesthetic, lens replacement, dramatic improvement
  • Driving safety advice: avoid conditions where vision is unsafe, particularly night driving

How to use your 8 minutes

  • 0-1 min — Introduction: Introduce yourself, confirm identity, open question. 'What's brought you in today?'
  • 1-4 min — Systematic History: Presenting complaint detail (SOCRATES for pain, timeline, severity). Systems review. PMH, medications, allergies.
  • 4-6 min — Context and ICE: Social history (smoking, alcohol, occupation, living situation). Family history. Ideas, Concerns, Expectations.
  • 6-7 min — Summary and Plan: Summarise findings back to patient. Share differential/working diagnosis. Outline investigation and management plan.
  • 7-8 min — Closing: Safety netting with specific red flags. Arrange follow-up. Check for questions.

Consultation approach

The opening

Cataracts are often mentioned casually by patients who attribute visual decline to ageing or needing new glasses. The candidate must assess functional impact (particularly driving and falls risk) and determine whether referral for surgery is appropriate. Mrs Goddard is 76, attending for a BP check, who mentions her vision has gradually become dimmer and blurrier over 2 years. Open with: 'That is important to mention. Tell me more about the vision changes and how they are affecting you.'

Core approach

Characterise the visual changes. Gradual dimming and blurring over 2 years. Worse in her left eye than right (cataracts often asymmetric). Difficulty reading (needs brighter light), difficulty with faces at a distance, glare from oncoming headlights at night (classic cataract symptom). She has stopped driving at night because of this. Colours seem washed out. She thinks she just needs new glasses.

Assess functional impact (this determines whether referral is appropriate). Night driving abandoned. Reading requires magnification and bright light. Falls risk: has she tripped or stumbled because of poor vision? She lives alone. Her independence depends on her vision. These functional impacts support referral.

Distinguish from other causes of gradual visual loss. Glaucoma: any peripheral vision loss? (Check confrontation fields.) Macular degeneration: any distortion of straight lines? Any central blind spots? Diabetic retinopathy: does she have diabetes? (No.) The gradual, bilateral, painless dimming with glare sensitivity is typical of cataracts.

Closing and safety netting

Explain the diagnosis: 'Mrs Goddard, what you are describing, the dimming, the blurring, and particularly the difficulty with glare at night, is very consistent with cataracts. This is where the lens inside your eye gradually becomes cloudy.' Reassure: 'Cataracts do not cause blindness. They are one of the most common and most successfully treated eye conditions.'

Referral: ophthalmology for assessment and likely cataract surgery (phacoemulsification with lens implant). Explain the surgery briefly: 'It is a day procedure done under local anaesthetic. They replace the cloudy lens with a clear artificial one. Most people notice a dramatic improvement.'

Address driving: 'Until your cataracts are assessed, please avoid driving in conditions where you feel unsafe, particularly at night.' Safety net: 'If you notice sudden vision loss, flashing lights, or a shadow across your vision, come in urgently as these suggest something different.' Follow-up after ophthalmology review.

How examiners mark this station

Examiners will focus on the thoroughness and structure of your history taking for age-related cataracts. Domain 1 (Data Gathering) carries the most weight: expect marks for systematic coverage of presenting complaint, red flags, PMH, medications, social and family history. Domain 2 (Clinical Management) requires a clear differential, appropriate investigations, and a safe management plan with safety netting. Domain 3 (Interpersonal Skills) is assessed throughout: genuine exploration of ICE, active listening, empathic responses, and clear communication without jargon.

Domain 1: Data Gathering, Technical and Assessment Skills (Primary focus)

Scores well: Visual symptoms characterised (dimming, glare, bilateral). Functional impact assessed (driving, reading, falls). Other causes excluded (glaucoma, AMD). Acuity tested if possible.

Costs marks: Not assessing functional impact. Not excluding other causes. Accepting 'needs new glasses.'

Domain 2: Clinical Management Skills (Primary focus)

Scores well: Ophthalmology referral arranged. Cataract surgery explained briefly. Driving advice given. Safety netting for acute visual changes.

Costs marks: Not referring. Suggesting glasses. No driving advice. No safety netting.

Domain 3: Interpersonal Skills (Throughout)

Scores well: Correcting the 'just ageing' assumption gently. Reassuring about cataract treatability. Explaining surgery in non-frightening terms. Addressing independence concerns.

Costs marks: Dismissing as ageing. Being alarmist about surgery. Not addressing independence.

Common examiner feedback (and how to fix it)

Did not gather sufficient information to make an adequate assessment of the patient's condition

Fix: Use a consistent framework for every history. After covering the presenting complaint, systematically move through PMH, drug history, social history, family history, and ICE. Keep a mental checklist.

Did not identify the patient's problems and/or did not develop a management plan adequately

Fix: Reserve the final 2 minutes to summarise your findings, share your working diagnosis with the patient, and outline your investigation and management plan including safety netting.

Common mistakes in this station

  1. Agreeing she just needs new glasses. She thinks new glasses will fix it. Cataracts cause progressive lens opacity that glasses cannot correct. Candidates who agree without assessing further delay appropriate referral.
  2. Not assessing functional impact. Cataract referral is appropriate when visual symptoms affect daily function. Candidates who diagnose cataracts without asking about driving, reading, and falls cannot justify the referral.
  3. Not distinguishing from glaucoma and macular degeneration. All three cause gradual visual loss in elderly patients. The pattern matters: cataracts cause dimming and glare, glaucoma causes peripheral loss, macular degeneration causes central distortion.

Resitting PLAB 2?

If you have previously struggled with history taking stations, focus on building a consistent systematic framework that you apply to every case. Practise structuring your history into clear phases (presenting complaint, systems review, PMH, social, ICE) so that even under pressure, you cover all domains. Many resitters lose marks not on knowledge but on organisation and time management.

Example opening

Good morning/afternoon, my name is Dr [Name], I'm one of the doctors here today. Could I confirm your name and date of birth please? Thank you. So, what's brought you in to see me today?

Frequently asked questions

What is the best way to take an age-Related cataracts history in PLAB 2?

Cataracts are often mentioned casually by patients who attribute visual decline to ageing or needing new glasses. The candidate must assess functional impact (particularly driving and falls risk) and determine whether referral for surgery is appropriate. Mrs Goddard is 76, attending for a BP check, who mentions her vision has gradually become dimmer and blurrier over 2 years.

Where are marks won and lost in this age-Related cataracts station?

Examiners reward: Visual symptoms characterised (dimming, glare, bilateral). Functional impact assessed (driving, reading, falls). Other causes excluded (glaucoma, AMD). Acuity tested if possible. Candidates are penalised for: Not assessing functional impact. Not excluding other causes. Accepting 'needs new glasses.'

Where do candidates most often go wrong in this station?

Agreeing she just needs new glasses. She thinks new glasses will fix it. Cataracts cause progressive lens opacity that glasses cannot correct.

Can I do well in this station without real-world experience of age-Related cataracts?

This station rewards process over personal experience. The skill being assessed: Functional impact assessment driving the referral decision: night driving abandoned, reading difficulty, falls risk in someone living alone. Work through the consultation approach above, then rehearse it aloud under the 8-minute time pressure so the structure holds up in the exam.

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