Dark adaptation compared with electrooculography in primary biliary cirrhosis

Area of Science:

• Ophthalmology
• Hepatology
• Clinical Nutrition

Background:

• Primary biliary cirrhosis (PBC) is a chronic liver disease.
• Asymptomatic patients may have subclinical complications.
• Vitamin A deficiency can affect vision.

Purpose of the Study:

• To investigate visual function in asymptomatic primary biliary cirrhosis patients.
• To correlate visual function with vitamin A levels and disease severity.

Main Methods:

• Assessed dark adaptation thresholds in PBC patients and controls.
• Measured serum vitamin A levels.
• Performed electrooculogram (EOG) in select cases.

Main Results:

• Significant impairment of dark adaptation was observed in PBC patients compared to controls.
• Only two patients had low vitamin A levels, both with high dark adaptation thresholds.
• Electrooculogram was reduced only in the most severely affected patient.

Conclusions:

• Dark adaptation impairment can occur in asymptomatic PBC patients.
• Vitamin A levels alone may not fully reflect visual function in PBC.
• Visual function testing is crucial for comprehensive assessment and treatment planning in PBC.