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Journal of Ophthalmology
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2019
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Article
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Tab 5
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Clinical Study
Femtosecond Laser Implantation of a 355-Degree Intrastromal Corneal Ring Segment in Keratoconus: A Three-Year Follow-Up
Table 5
The efficacy index and safety index of the procedure.
ā
3 months
6 months
12 months
24 months
36 months
Safety index
2.27
2.27
1.95
1.81
1.70
Efficacy index
1.59
1.59
1.45
1.32
1.09