Clinical Description of Anophthalmia
A patient with no eye in the socket should be clinically described as having "anophthalmia" - the complete absence of the globe within the orbit 1.
Terminology and Clinical Presentation
The proper clinical terminology is anophthalmia, which specifically refers to the absence of the ocular globe within the orbital cavity. This condition typically presents with:
- Enophthalmos (posterior displacement/sunken appearance of the affected side)
- Orbital asymmetry with the affected socket appearing retracted compared to the contralateral side
- Absence of any visible globe structure on examination
1 describe enophthalmos as being caused by developmental conditions resulting in an absent globe (anophthalmia), distinguishing this from microphthalmia (small globe) or other causes of posterior globe displacement.
Classification and Etiology
Anophthalmia can be:
- Unilateral or bilateral - affecting one or both orbits 2, 3
- Isolated or syndromic - occurring alone (in approximately two-thirds of cases) or as part of a broader syndrome (one-third of cases) 2, 4
- Primary, secondary, or degenerative - based on the developmental stage at which the defect occurred 5
The combined birth prevalence is up to 30 per 100,000 population 2. Causes include chromosomal abnormalities, monogenic mutations (SOX2, PAX6, OTX2, CHD7, FOXE3, BCOR), and environmental factors such as gestational infections or teratogenic exposures 2, 4, 6.
Key Clinical Examination Findings
When documenting an anophthalmic patient, note:
- Orbital examination: Empty socket with absent globe, orbital volume deficiency
- Facial asymmetry: Underdeveloped orbital rim and surrounding bony structures
- Associated ocular anomalies: In the contralateral eye if unilateral (present in 50% of cases) 4
- Systemic features: Screen for syndromic associations (present in 58-89% of cases) 4, 7
Important Clinical Pitfalls
Do not confuse anophthalmia with:
- Severe microphthalmia - where a rudimentary globe may be present but extremely small 2, 3
- Cryptophthalmos - where the eye is present but covered by skin
- Extreme enophthalmos from other causes - such as orbital trauma, silent sinus syndrome, or orbital fat atrophy 1
Associated Findings Requiring Assessment
Patients with clinical anophthalmia have a high incidence of developmental abnormalities:
- 88% have bilateral ocular abnormalities (even if only one eye appears absent)
- 71% have intracranial anomalies 7
- 100% incidence of CNS anomalies when bilateral small optic nerves are present on imaging 7
Therefore, comprehensive neuroimaging (CT or MRI of orbits and brain) is essential 4, 7, along with genetic evaluation and multidisciplinary assessment including ophthalmology, pediatrics, and clinical genetics 3, 4, 8.
The clinical description should specify laterality, associated findings, and whether the condition appears isolated or syndromic to guide appropriate management and genetic counseling.