case_images: PMC3752625_01
case_images: A case with PMD in one eye and PLK in the other.. (
  A): The right eye is PLK; notice the absence of the bell sign. (
  B): The left eye is PMD; notice the presence of this sign.
case_images: f1000research-1-217-g0004.jpg
case_images: PMC3752625_01_f1000research-1-217-g0004.jpg
case_images: f5
case_images: Corneal tomography (Figures 5a and b) revealed inferior peri-limbal steepening with the crab claw pattern on the anterior sagital curvature map in both eyes.