Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.
2 min synopsisUK scopeSources checked 7 Sept 2026Clinical review pending
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Displacement with pain or sudden loss
A displaced lens can obstruct aqueous flow, damage the cornea or accompany retinal injury. Pain, redness, nausea or acute loss of vision requires urgent assessment.
Action: Contact emergency ophthalmology. In suspected Marfan syndrome, acute severe chest or back pain, collapse or neurological symptoms also requires an emergency aortic assessment.
Synopsis
Recognise displaced natural or artificial lenses, identify urgent ocular complications and investigate systemic disorders that change management and family care.
Ectopia lentis is displacement of the natural lens caused by deficient zonular support.
Subluxation is partial displacement; complete dislocation may move the lens into the anterior chamber or vitreous.
Blur, unstable refraction and monocular double images are clues to a lens-position problem.
Key red flags
A lens in the anterior chamber with pain, corneal clouding or pressure elevation is an ophthalmic emergency.
Investigation priorities
01
Detailed ocular examinationFirst step
Define lens position, correctable vision and urgent structural complications.
Management branches
Urgent eye problemProtect the eye from immediate complications
Displacement is associated with acute pain, sudden visual loss or traumatic injury.
Arrange urgent ophthalmology assessment and communicate the lens finding, mechanism of injury and warning symptoms.
Protect a potentially injured globe from pressure and assess associated trauma or systemic deterioration through emergency services.
Stable ectopia lentisMaintain vision while defining long-term management
The lens is displaced but there is no acute pressure, corneal or retinal emergency.
National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 7 Sept 2026; clinical approval remains outstanding.
NHS Genomics Education: classical homocystinuriaArchived November 2019 NHS educational factsheet, no longer updated; retained for presentation and diagnostic-test explanations, checked against the cited CBS-deficiency guideline.