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Presentation type	E-poster
Title	Corneal biomechanics after implantation of intracorneal ring segments (ICRS) in keratoconus

Purpose	To analyze changes in corneal biomechanical properties after implantation of intracorneal ring segments (ICRS) in keratoconus (KC).
Methods	This retrospective single-center study included 118 patient eyes that underwent femtosecond laser ICRS implantation for KC. Biomechanical analysis was performed preoperatively and after 6 months, 1 and 2 years using Ocular Response Analyzer®, with determination of Corneal resistance factor (CRF), Corneal hysteresis (CH), as well as by Corvis ST®, with determination of stiffness parameter A1 (SP-A1), Ambrosio's relational thickness to the horizontal profile (Arth), integrated radius (IR) and deformation amplitude-ratio (DA-ratio).
Results	The CRF decreased significantly postoperatively (5.8 ± 1.7 mmHg) compared to preoperatively (6.8 ± 3.7 mmHg; p < 0.001), and increased again during follow-up (6.2 ± 1.9 mmHg; p = 0.005), without regaining preoperative values. CH did not change significantly. SP-A1 (p = 0.013) and IR (p = 0.049) increased significantly after ICRS implantation. Arth decreased significantly from 190 ± 88 to 157 ± 108 (p < 0.001). However, there was no significant postoperative change for DA-ratio.
Conclusion	Corneal biomechanical properties showed inconsistent changes after ICRS implantation. Classical corneal biomechanical parameters (using single central air-puff tonometers) do not seem to be suitable for follow-up after ICRS implantation.
Conflict of interest	No

Authors 1

Last name	HAMON
Initials	L
Department	Saarland University Medical Center
City	Homburg, Germany

Authors 2

Last name	Pfahl
Initials	LJ
Department	Saarland University Medical Center
City	Homburg, Germany

Authors 3

Last name	Flockerzi
Initials	E
Department	Saarland University Medical Center
City	Homburg, Germany

Authors 4

Last name	Berger
Initials	T
Department	Saarland University Medical Center
City	Homburg, Germany

Authors 5

Last name	Langenbucher
Initials	A
Department	Saarland University Medical Center
City	Homburg, Germany

Authors 6

Last name	Seitz
Initials	B
Department	Saarland University Medical Center
City	Homburg, Germany

Authors 7

Last name	Daas
Initials	L
Department	Saarland University Medical Center
City	Homburg, Germany