Which imaging modality best visualizes endothelial cells for detecting polymegathism/pleomorphism?

Which imaging modality best visualizes endothelial cells for detecting polymegathism/pleomorphism?

• A. Slit lamp examination
• B. OCT
• C. Specular microscopy
• D. Ultrasound pachymetry

Answer: (C)

Direct visualization of the corneal endothelium to assess the variation in cell size and shape is best achieved with specular microscopy. This modality images the endothelial cell mosaic directly, letting you see individual cell borders and assess metrics like cell density, the degree of size variation (polymegathism), and shape variation (pleomorphism), as well as hexagonality. Slit-lamp examination can reveal signs of endothelial dysfunction such as edema, but it doesn’t resolve endothelial cells well enough to measure cell size or shape. OCT provides detailed cross-sectional images of corneal layers but isn’t used to visualize the endothelial mosaic in routine practice. Ultrasound pachymetry measures corneal thickness, not cellular morphology.

Direct visualization of the corneal endothelium to assess the variation in cell size and shape is best achieved with specular microscopy. This modality images the endothelial cell mosaic directly, letting you see individual cell borders and assess metrics like cell density, the degree of size variation (polymegathism), and shape variation (pleomorphism), as well as hexagonality.

Slit-lamp examination can reveal signs of endothelial dysfunction such as edema, but it doesn’t resolve endothelial cells well enough to measure cell size or shape. OCT provides detailed cross-sectional images of corneal layers but isn’t used to visualize the endothelial mosaic in routine practice. Ultrasound pachymetry measures corneal thickness, not cellular morphology.