How does corneal bleb formation appear within the slit lamp?

How does corneal bleb formation appear within the slit lamp?

• A. Endothelial black spots best seen with specular microscopy
• B. Diffuse stromal haze
• C. Epithelial microcysts
• D. Posterior subcapsular opacities

Answer: (A)

Corneal bleb formation reflects tiny fluid-filled spaces at or near the endothelial surface. The corneal endothelium normally keeps the stroma detached to maintain clarity, but when it’s stressed or damaged, microcysts or blebs can form and alter how light is reflected from the back of the cornea. These changes are best seen with specular microscopy, which directly images the endothelial cell layer. On that imaging, blebs appear as dark or “black” spots against the reflective endothelial mosaic because those fluid-filled spaces don’t reflect light like healthy cells. That makes the description of endothelial black spots the most accurate way to characterize corneal bleb formation. In contrast, diffuse stromal haze indicates general stromal edema rather than discrete endothelial blebs. Epithelial microcysts involve the corneal epithelium, not the endothelium, and posterior subcapsular opacities are lens-related, not corneal.

Corneal bleb formation reflects tiny fluid-filled spaces at or near the endothelial surface. The corneal endothelium normally keeps the stroma detached to maintain clarity, but when it’s stressed or damaged, microcysts or blebs can form and alter how light is reflected from the back of the cornea. These changes are best seen with specular microscopy, which directly images the endothelial cell layer. On that imaging, blebs appear as dark or “black” spots against the reflective endothelial mosaic because those fluid-filled spaces don’t reflect light like healthy cells. That makes the description of endothelial black spots the most accurate way to characterize corneal bleb formation.

In contrast, diffuse stromal haze indicates general stromal edema rather than discrete endothelial blebs. Epithelial microcysts involve the corneal epithelium, not the endothelium, and posterior subcapsular opacities are lens-related, not corneal.