Increased preference of surface ablation over laser in situ keratomileusis between 2008–2011 is correlated to risk of ecatasia

Figures & data

Table 1 The ectasia risk score system used in this study, which was the ERFSS reported by Randleman et al,¹⁵ without the corneal topography

Parameter	Points
	4	3	2	1	0
RSB (μm)	<240	240–259	260–279	280–299	>300
Age (years)	18–21	22–25	26–29	>30
CT (μm)	<450	451–480	481–510	>510
MRSE (D)	>−14	−12 to −14	−10 to −12	−8 to −10	−8 or less

Abbreviations: RSB, residual stromal bed thickness; CT, corneal thickness; MRSE, manifest refraction spherical equivalent; D, diopters.

Table 2 The distribution of eyes between the risk factor score groups for each parameter

Parameter	Risk score group (%)
	4	3	2	1	0
RSB (μm)	0.6	1.8	3.9	7.1	86.6
Age (years)		24.7	26.4	15.2	33.7
CT (μm)	0.8	5.5	18.3		75.4
MRSE (D)	0	0	1.0	3.9	95.1

Abbreviations: RSB, residual stromal bed thickness; CT, corneal thickness; MRSE, manifest refraction spherical equivalent; D, diopters.

Figure 1 The distribution of the risk score in the eyes included in the study.

Note: Values are presented in percentages.
Abbreviation: EFRSS, Ectasia Risk Factor Score System.

Figure 2 The distribution of LASIK and surface ablation procedures according to the risk score of (A) RSB; (B) MRSE; (C) age; and (D) CT.

Note: The relative proportion of the procedures for each risk score is presented in percentages.
Abbreviations: LASIK, laser in situ keratomileusis; RSB, residual stromal bed thickness; MRSE, manifest refraction spherical equivalent; CT, corneal thickness.

Figure 3 The distribution of LASIK and surface ablation procedures according to the overall risk score.

Note: The relative proportion of the procedures for each score is presented in percentages.
Abbreviations: EFRSS, Ectasia Risk Factor Score System; LASIK, laser in situ keratomileusis.

Figure 4 The relative proportions of LASIK and surface ablation procedures by quarters, from 2008 to 2011.

Note: values are presented in percentages.
Abbreviation: LASIK, laser in situ keratomileusis.

Table 3 Distribution of procedures between 2008–2011

Year	Total eyes	LASIK (%)	Surface ablation (%)
2008	3521	53.90	48.10
2009	4154	46.84	53.16
2010	4138	27.81	72.19
2011	4350	28.02	71.98

Abbreviation: LASIK, laser in situ keratomileusis.

RandlemanJBWoodwardMLynnMJStultingRDRisk assessment for ectasia after corneal refractive surgeryOphthalmology20081151375017624434

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