Ophthalmia Neonatorum: The Sticky Eye That Can Perforate a Cornea

A newborn with a sticky eye is usually a blocked tear duct. Occasionally it is an organism that can perforate a cornea within two days.

Ophthalmia neonatorum is conjunctivitis occurring in the first month of life, and it is defined by age rather than by cause.

That definition matters, because the causes range from a self-limiting chemical irritation to gonococcal infection that constitutes an ophthalmic emergency.

The neonatal cornea offers little resistance to Neisseria gonorrhoeae, which is one of the few organisms able to penetrate intact corneal epithelium.

The single most useful clinical discriminator is the day of onset, and the second is the character of the discharge.

Recognising the hyperacute presentation, and treating it systemically rather than topically, is what preserves sight in these infants.

What Is Ophthalmia Neonatorum?

Ophthalmia neonatorum, also called neonatal conjunctivitis, is any conjunctival inflammation presenting within the first 28 days of life.

The main causes, and their characteristic timing, are:

Chemical conjunctivitis – within the first 24 hours, from topical prophylaxis, and self-limiting
Gonococcal – classically day 2 to 5, hyperacute, with profuse purulent discharge and a genuine risk of corneal perforation
Chlamydial – typically day 5 to 14, the commonest infectious cause in many settings, with associated risk of pneumonitis
Other bacterial – staphylococcal, streptococcal and Gram-negative organisms, with variable timing
Herpes simplex – usually day 6 to 14, often with vesicles, and a marker of potentially disseminated neonatal HSV

Timing narrows the differential quickly, but it is a guide rather than a rule, and cultures still decide the diagnosis.

Epidemiology

The pattern of disease is closely tied to maternal health services and prophylaxis policy.

Chlamydia is the most frequently identified infectious cause in most high-income settings
Gonococcal disease is far less common where antenatal screening and neonatal prophylaxis are established, but remains a significant cause elsewhere
Incidence correlates directly with the prevalence of untreated maternal genital infection
Transmission is usually during passage through an infected birth canal, though chlamydial infection can occur after caesarean section with ruptured membranes
Ophthalmia neonatorum remains a preventable cause of childhood blindness in settings without prophylaxis

This is a condition where public health measures – antenatal screening and universal prophylaxis – have done more to reduce blindness than any treatment given after the fact.

Pathophysiology

The neonatal ocular surface is unusually vulnerable, which explains the speed of the disease.

The newborn conjunctiva lacks mature lymphoid tissue and the infant has limited local immunity
Tear production and the mechanical clearance it provides are reduced in the first weeks
Neisseria gonorrhoeae is able to penetrate intact corneal epithelium, unlike most bacteria, which is why it can cause ulceration and perforation so rapidly
Intense neutrophilic infiltration produces the characteristic profuse purulent discharge and marked lid oedema
Chlamydia trachomatis is an obligate intracellular organism producing a more indolent papillary conjunctivitis, and true follicles do not form in neonates because lymphoid tissue is immature

The absence of follicles in a neonate is a useful point – chlamydial ophthalmia neonatorum looks different from the follicular chlamydial conjunctivitis seen in older children and adults.

Risk Factors

Maternal

Untreated maternal gonococcal or chlamydial genital infection
Absent or inadequate antenatal care and screening
Active maternal genital herpes at the time of delivery
Prolonged rupture of membranes

Neonatal

Vaginal delivery through an infected birth canal
Prematurity
Omitted or ineffective neonatal ocular prophylaxis
Nasolacrimal duct obstruction, which predisposes to secondary bacterial infection

The maternal history is a central part of this diagnosis, and needs to be asked about explicitly rather than assumed from the notes.

Clinical Presentation

Symptoms and Timing

Eyelid swelling and discharge, with the day of onset guiding the likely organism
Hyperacute, copious, thick purulent discharge that reaccumulates within minutes of being cleaned – highly suggestive of gonococcal infection
More watery or mucopurulent discharge with milder lid swelling in chlamydial disease
Vesicles on the lids or periocular skin, or a keratitis, suggesting herpes simplex
Systemic features – respiratory symptoms with chlamydia, or lethargy and poor feeding suggesting disseminated infection

Examination Findings

Marked, sometimes tense eyelid oedema, which can make examination difficult
Copious purulent discharge, characteristically under pressure in gonococcal disease
Intense conjunctival injection and chemosis
Papillary reaction of the palpebral conjunctiva; follicles are absent in neonates
Careful corneal assessment for haze, ulceration or perforation – the finding that determines urgency
A pseudomembrane may be present in severe cases

The cornea must be examined in every case, however difficult the lids make it, because corneal involvement changes this from an outpatient problem to an emergency admission.

Diagnostic Evaluation

Microbiology

Conjunctival swabs for Gram stain, which can show Gram-negative intracellular diplococci in gonococcal infection and allow immediate treatment
Culture on appropriate media, including chocolate agar for Neisseria
Nucleic acid amplification testing for Chlamydia trachomatis, which is more sensitive than culture
Viral PCR and culture where herpes simplex is suspected

Systemic Assessment

Evaluation for disseminated gonococcal infection, including arthritis, sepsis and meningitis
Assessment for chlamydial pneumonitis, which can develop weeks after the conjunctivitis
Full septic screen and paediatric involvement where systemic infection is suspected

Parental Investigation

Both parents require sexual health assessment and treatment
Untreated parental infection is a route to reinfection and to further affected children

Treating the baby without treating the parents leaves the problem in place, so referral to sexual health services is part of the management, not an optional extra.

Differential Diagnosis

Conditions to distinguish from infectious ophthalmia neonatorum include:

Chemical conjunctivitis – within 24 hours of prophylaxis, mild, and resolving spontaneously
Congenital nasolacrimal duct obstruction – persistent watering and mild mucoid discharge without significant lid swelling or injection
Congenital glaucoma – watering and photophobia with corneal haze and an enlarged cornea, not discharge
Dacryocystitis – swelling centred over the lacrimal sac at the medial canthus
Preseptal or orbital cellulitis – diffuse lid erythema rather than conjunctival discharge as the dominant feature

Congenital glaucoma is the important non-infectious mimic, because a watering, photophobic infant with a hazy cornea has a completely different and equally urgent pathway.

Management

Gonococcal Disease – An Emergency

Systemic antibiotic therapy, typically a single dose of a third-generation cephalosporin such as ceftriaxone or cefotaxime – topical treatment alone is inadequate
Frequent saline irrigation of the conjunctival sac to clear the purulent discharge
Hospital admission, paediatric involvement and assessment for disseminated infection
Urgent ophthalmology review with close monitoring of the cornea

Chlamydial Disease

Systemic oral macrolide therapy, since topical treatment does not eradicate nasopharyngeal carriage and does not prevent pneumonitis
Awareness of the association between oral erythromycin in young infants and infantile hypertrophic pyloric stenosis
Follow-up for respiratory symptoms in the weeks after treatment

Other Causes and Prevention

Herpes simplex requires systemic aciclovir and paediatric assessment for disseminated or CNS disease, alongside topical antiviral therapy
Other bacterial causes are treated with topical antibiotics guided by culture
Neonatal ocular prophylaxis at birth, where policy provides for it, together with antenatal screening and treatment of maternal infection

The recurring theme across the two most serious causes is the same: both need systemic treatment, and topical therapy alone is a treatment failure waiting to happen.

Prognosis

Outcome depends almost entirely on cause and on how quickly systemic treatment starts.

Chemical conjunctivitis resolves within a day or two with no sequelae
Chlamydial conjunctivitis has a good ocular prognosis when treated, though untreated infants risk pneumonitis
Gonococcal infection treated promptly usually resolves without visual loss
Delayed gonococcal treatment can cause corneal ulceration, perforation, endophthalmitis and permanent blindness
Neonatal herpes carries a prognosis dominated by the systemic disease rather than the eye

Ophthalmia neonatorum is one of the clearest examples in ophthalmology of a condition where the difference between a normal eye and a blind one is measured in hours of delay.

References

World Health Organization. WHO guidelines for the treatment of Neisseria gonorrhoeae.
Centers for Disease Control and Prevention. Sexually Transmitted Infections Treatment Guidelines: Ophthalmia Neonatorum.
Matejcek A, Goldman RD. Treatment and prevention of ophthalmia neonatorum. Canadian Family Physician. 2013.
Ophthalmia Neonatorum. StatPearls, NCBI Bookshelf.
Ophthalmia Neonatorum. EyeWiki, American Academy of Ophthalmology.