Risk Assessment for Corneal Ectasia following Photorefractive Keratectomy

Table 5

The distribution of eyes according to ectasia risk score system (ERSS) scores for each risk parameter.

Parameter		Points
		4	3	2	1	0
Topography	()	20.7%	41.4%		17.2%	20.7%
RSB^a	()	0%	0%	0%	13.6%	86.4%
Age	()		17.2%	17.2%	0	65.6%
Pachymetry	()	8.0%	8.0%	60.0%		24.0%
SEQ^b	()	0%	3.5%	0%	10.3%	86.2%

^aResidual stromal bed; ^bmanifest refraction spherical equivalent; included in this analysis were eyes that had available data for the specific parameter tested.