Figure 5.

The representative images demonstrating the epithelium and pattern of POV at different locations in a healthy adult aged 82 years old. The typical pattern of POV was only found in the superior quadrant of the right eye. The epithelium was wavy in the superior quadrant in the left eye. There were pingueculae at the nasal limbus in both eyes, which made the maximum ET of POV even thinner than the peripheral cornea. In the temporal and inferior quadrants of both eyes, the POV lost the typical subepithelial stroma pattern.