Retinopathy of Prematurity (ROP)

Why is this topic important?

Retinopathy of prematurity is an important preventable cause of childhood visual impairment. It is highly relevant to MRCPCH because candidates need to know risk factors, screening principles and why careful oxygen management matters in preterm infants.

Definition

Retinopathy of prematurity is an abnormal development of retinal blood vessels in premature infants.

It may range from mild disease that regresses spontaneously to severe disease causing retinal detachment and blindness.

Key MRCPCH Facts

Risk increases with lower gestation and lower birth weight.
Oxygen exposure is an important modifiable risk factor.
Screening is essential because early disease is not visible externally.
Severe ROP may require laser or anti-VEGF treatment.
Untreated severe ROP can lead to retinal detachment and blindness.

Pathophysiology

Normal retinal vascularisation is incomplete in preterm infants.

After preterm birth:

Phase 1

Relative hyperoxia suppresses vascular growth factors.

This leads to delayed normal retinal vessel development.

Phase 2

As the retina becomes metabolically active, relative hypoxia develops.

This stimulates abnormal neovascularisation.

Fragile new vessels may lead to:

Fibrosis
Traction
Retinal detachment

Risk Factors

Major Risk Factors

Extreme prematurity
Very low birth weight
Oxygen therapy

Additional Risk Factors

Sepsis
Poor postnatal growth
Blood transfusions
Prolonged ventilation
Chronic lung disease

Clinical Features

ROP is usually asymptomatic in the early stages.

There may be:

No external eye abnormality
Normal-looking eyes
No obvious visual symptoms initially

This is why screening is essential.

Screening

ROP screening is performed by trained ophthalmology teams according to national and local criteria.

Screening considers:

Gestational age
Birth weight
Postnatal age
Clinical risk factors

MRCPCH candidates should know that eligible premature infants must not be missed.

Investigations

Retinal Examination

Performed by trained ophthalmologist or trained screening professional.

Assesses:

Zone
Stage
Extent
Plus disease

Documentation

Important for:

Follow-up timing
Treatment planning
Communication with parents

Management

Observation

Many mild cases regress spontaneously.

Treatment

For severe or treatment-threshold disease:

Laser therapy
Anti-VEGF treatment in selected infants

Follow-Up

Long-term ophthalmology follow-up may be needed.

Complications

Eye Complications

Retinal detachment
Blindness
Myopia
Strabismus
Amblyopia

Wider Impact

Developmental delay may coexist due to prematurity-related complications.

Common Exam Traps

Trap 1

Normal-looking eyes do not exclude ROP.

Trap 2

ROP screening is based on eligibility criteria, not symptoms.

Trap 3

Oxygen is lifesaving but excessive oxygen exposure increases ROP risk.

Trap 4

ROP can progress rapidly; missed appointments are dangerous.

One Minute Revision

ROP = abnormal retinal vascular development in preterm infants.
Major risks: prematurity, low birth weight, oxygen exposure.
Screening is essential.
Severe disease may need laser or anti-VEGF.
Untreated severe ROP can cause blindness.

Suggested References

RCPCH Guideline: Screening of Retinopathy of Prematurity
Royal College of Ophthalmologists Guidance
BAPM Guidance
Nelson Textbook of Pediatrics
Rennie & Roberton’s Textbook of Neonatology

Disclaimer

These notes are intended for MRCPCH revision and educational purposes only. They do not replace local, national or institutional guidelines. Clinical decisions should always be based on current guidance, senior advice and individual patient circumstances.

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