Cataract & Lens Disorders
Assess gradual visual loss, discuss surgery and recognise postoperative warning signs.
Quick revision ↓ Medical Dictionary
01Recognising cataract
Lens opacity commonly causes gradual painless blur, glare and reduced contrast, often affecting night driving or reading. Symptoms and slit-lamp findings should agree. Cataract can coexist with retinal or optic nerve disease, so a visible opacity does not explain every visual complaint. Sudden loss, pain or a new field defect requires another urgent assessment.
02Functional impact
Ask how vision affects daily tasks, independence, work and falls risk. Measure acuity, but do not use one chart threshold as the sole basis for referral. Discuss the expected benefit of surgery in the context of other eye disease and the person’s priorities. A patient with modest chart reduction can still have substantial glare-related disability.
03Preoperative planning
Assessment includes ocular examination, biometry and discussion of lens choice and refractive expectations. Confirm the correct eye and relevant medicines, allergies and comorbidities. Explain that spectacles may still be needed. Consent includes benefits, alternatives and material risks such as infection, retinal complications or an unexpected refractive outcome, tailored to the individual.
04Surgery and recovery
Cataract surgery removes the cloudy lens and usually replaces it with an intraocular lens. The procedure and anaesthetic plan are selected by the surgical team. Postoperative drops, activity advice and follow-up should be clearly explained in an accessible format. Increasing pain, redness or visual loss requires urgent contact rather than waiting for a scheduled visit.
05Other lens problems
Lens displacement may follow trauma or systemic connective-tissue disease and requires specialist evaluation. Posterior capsule opacification can cause later blur after otherwise successful surgery and may be treated with laser when appropriate. Do not label every postoperative visual decline as capsule opacity without examining for retinal, pressure-related or infectious complications.
High-Yield Revision
- Referral considers function as well as chart acuity.
- Cataract may coexist with retinal disease.
- Worsening pain or vision after surgery is urgent.
Common Pitfalls
- Promising perfect unaided vision after surgery.
- Attributing sudden loss to a pre-existing cataract.
References & Further Reading
Read the relevant guideline sections alongside these original clinical teaching cases. Local pathways, available services and individual patient factors determine care.
Reference review: 28 September 2026. Consult current local protocols for prescribing, procedures and escalation.