This article is written for medical professionals, expert witnesses, and the solicitors handling neonatal and paediatric ophthalmology claims. It clarifies the clinical, legal, and evidential expectations surrounding retinopathy of prematurity (ROP) screening and management, and shows where an ophthalmology expert witness focuses when assessing whether harm was avoidable.
1. Why retinopathy of prematurity matters in medico-legal practice
ROP combines three characteristics that make it a frequent source of claims: the high vulnerability of premature infants, a rapid disease course requiring timely detection, and clear UK national guidelines outlining responsibilities. When standards deviate, irreversible blindness or severe visual impairment may result. Expert witnesses are often asked to analyse whether these outcomes were avoidable.
2. Who should be screened: understanding the criteria
UK guidelines specify which infants require ROP screening. Screening is mandatory for babies born at less than 32 weeks gestation and babies with a birth weight below 1501 grams. Medical professionals and expert witnesses must recognise that failure to identify eligible infants is a breach of duty in itself. Courts view this as a systems failure, not merely a clinical oversight.
3. Timing of screening: the most common source of negligence
ROP screening is time critical. Examinations must be performed by 31 weeks post-menstrual age, or by four weeks chronological age, whichever is later. Claims frequently arise when:
- the first examination occurs too late
- babies are transferred between units without clear handover
- screening is overlooked during neonatal instability or transport
- documentation is incomplete
The law expects neonatal and ophthalmology teams to ensure screening is not missed, regardless of logistical pressure.
4. Recording findings: documentation is often the deciding factor
The ROP examination is not simply a clinical procedure. It is a medico-legal record of the infant's retinal status at a specific moment in time. Documentation should include the zone of vascularisation, the stage of any ROP, the presence of plus disease, the clock hours involved, the clarity of view, and the planned follow-up interval. When documentation is sparse, courts often infer a substandard examination or inadequate assessment.
5. Follow-up and interval breach
ROP may progress rapidly. Poor scheduling or overly long intervals constitute breach when infants are reviewed later than guideline timeframes, when follow-up does not match disease severity, when discharge occurs before retinal vascularisation is complete, or when communication between teams is unclear. Expert witnesses must determine whether the follow-up plan matched accepted practice at the time.
6. Treatment thresholds: when delay becomes causative
Timely treatment is essential. Based on ETROP recommendations, treatment should occur for Type 1 ROP, Zone 1 disease with plus, posterior Zone 2 Stage 3 with plus, and aggressive posterior ROP. Delays in initiating laser or anti-VEGF treatment remain one of the most litigated aspects of ROP care. The expert must evaluate when treatment should have occurred, whether the disease had already progressed to an irreversible stage, and whether earlier intervention would likely have changed the visual outcome. Causation analysis is central: the question is not whether blindness occurred, but whether it was preventable.
7. Transfer of care: a critical system vulnerability
Many ROP claims arise from failures during transfers between neonatal intensive care units, special care baby units, community follow-up pathways, and hospitals across regions. At each transfer, responsibility for screening must be explicitly handed over. Experts often identify that screening was assumed to have occurred, resulting in missed examinations. This is a system-level breach, not a clinician-level failure.
8. Discharge without full vascularisation: an avoidable risk
Discharging infants before the retina is fully vascularised is unsafe unless a robust outpatient follow-up plan is guaranteed. Negligence may arise when no discharge plan is recorded, community teams are not informed, parents are unaware of the importance of follow-up, or appointments are not scheduled before discharge. Expert witnesses should consider whether earlier completion of vascularisation or timely follow-up would have prevented progression to sight-threatening disease.
9. Long-term impact: what experts must explain to the court
ROP does not end with early treatment. Children may later develop high myopia, strabismus, glaucoma, retinal detachment, reduced acuity, and social and educational difficulties. The expert's report must articulate the visual prognosis, the functional implications, whether harm was avoidable, whether disability is permanent, and whether secondary complications were predictable. Courts rely on this clarity when assessing quantum and long-term care needs.
Conclusion
ROP litigation concentrates on three fundamental pillars: timely screening, appropriate follow-up, and urgent treatment when indicated. Medical professionals and expert witnesses must understand not only the clinical pathway but also the legal expectations that govern ROP care. Accurate documentation, stable systems, and timely recognition of disease progression remain essential safeguards. For the court, the ophthalmic expert provides the scientific framework needed to determine whether harm was preventable.
Frequently asked questions
Which babies must be screened for retinopathy of prematurity in the UK?
UK guidelines make screening mandatory for babies born at less than 32 weeks gestation and babies with a birth weight below 1501 grams. Failure to identify an eligible infant is regarded by the courts as a systems failure and a breach of duty in itself.
Why is the timing of ROP screening a common source of negligence claims?
ROP screening is time critical. The first examination must occur by 31 weeks post-menstrual age or by four weeks chronological age, whichever is later. Claims arise when the first examination is late, when babies are transferred between units without clear handover, or when screening is overlooked during neonatal instability.
How does causation work in ROP litigation?
The central question is not whether blindness occurred, but whether it was preventable. The expert evaluates when treatment should have occurred, whether the disease had already progressed to an irreversible stage, and whether earlier laser or anti-VEGF intervention would likely have changed the visual outcome.
Related insights
For related paediatric analysis, see our commentary on the red reflex examination and its medico-legal importance and on breach, causation and prognosis in paediatric cataract. You can also read more about our approach to ophthalmology clinical negligence work or browse all Insights.