Laboratory Studies
- Peters anomaly is a clinical diagnosis. Depending on the physical examination, laboratory studies may be warranted.
- The only specific test for Peters anomaly is histopathology of the cornea (see Histologic Findings).
Imaging Studies
- The following imaging studies may be performed based on the clinical findings from the physical examination:
- MRI
- MRI of the brain and the spinal cord are indicated to rule out neurologic defects.
- MRI of the abdomen is indicated to rule out genitourinary abnormalities.
- Echocardiogram (ECHO) is indicated to rule out cardiac defects.
- Ocular ultrasonogram
- Ocular ultrasonogram is a useful tool to help diagnose Peters anomaly and to differentiate it from other causes of corneal opacity.
- Ocular ultrasonogram is also helpful in assessing associated anterior segment abnormalities.[19]
- Ocular ultrasonogram shows hypoechogenicity of the anterior stroma that histopathologically correlates with the absence of the Bowman layer and the presence of stromal edema.[19]
- MRI
Other Tests
- To rule out hearing abnormalities, hearing tests may be performed.
Procedures
- A thorough ocular examination is done under anesthesia.
- External photographs, ocular ultrasonogram (see Imaging Studies), intraocular pressure, and retinoscopy may also be performed.
Histologic Findings
Histopathology is often diagnostic. Histologic findings show either thinning or absence of the Descemet membrane or the endothelium. The lens may be normal, or it may be cataractous and adhere to the cornea. The stromal lamellae are irregular and more closely packed. Undifferentiated iris strands attach to the posterior surface of the cornea.
Histochemical studies have shown absence of keratan sulfate in both the cornea and the sclera.
Immunohistochemical studies have shown increased amounts of fibronectin and type VI collagen in the corneas of patients with Peters anomaly.[20, 21]
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