The Superficial Stromal Scar Formation Mechanism in Keratoconus: A Study Using Laser Scanning In Vivo Confocal Microscopy

Table 1

The classification of keratoconus.

Stage	Characteristics
Mild-to-moderate; keratoconus	Eccentric corneal steepening
	Induced myopia and/or astigmatism ≤ 8 D
	Corneal radii ≤ 53 D
	Vogt striae, no scars
	Corneal thickness ≥ 400 m
Advanced keratoconus	Induced myopia and/or astigmatism > 8 D, even refraction not measurable
	Corneal radii > 53 D
	Corneal thickness < 400 m
	No acute corneal hydrops or perforation