Imaging Mass Spectrometry by Matrix-Assisted Laser Desorption/Ionization and Stress-Strain Measurements in Iontophoresis Transepithelial Corneal Collagen Cross-Linking

Table 4

Stress value for 4%, 6%, 8%, and 10% strains in human corneas.

Groups	Stress at 4% (10^3 Pa)	Stress at 6% (10^3 Pa)	Stress at 8% (10^3 Pa)	Stress at 10% (10^3 Pa)
Group A
S-CXL	194.3 ± 86.7; ( = 3.2 × 10^6 Pa)	349.3 ± 193.8; ( = 6 × 10^6 Pa)	574.3 ± 309.9; ( = 11.3 × 10^6 Pa)	850.3 ± 487.4; ( = 21.4 × 10^6 Pa)
Group B
TE-CXL	114 ± 32.4; ( = 1.8 × 10^6 Pa)	200.6 ± 50.8; ( = 3.1 × 10^6 Pa)	308.6 ± 58.1; ( = 5.2 × 10^6 Pa)	437.6 ± 53.4; ( = 8.6 × 10^6 Pa)
Group C
I-CXL 3 mW	123.6 ± 47.5; ( = 2.2 × 10^6 Pa)	238.3 ± 57.2; ( = 3.8 × 10^6 Pa)	388.3 ± 44.8; ( = 6.7 × 10^6 Pa)	576 ± 45; ( = 11.8 × 10^6 Pa)
Group D
I-CXL 10 mW	150.3 ± 61.6; ( = 2.9 × 10^6 Pa)	276.9 ± 115.4; ( = 5.2 × 10^6 Pa)	449.7 ± 184.4; ( = 9.3 × 10^6 Pa)	661.75 ± 280.9; ( = 16.6 × 10^6 Pa)

Legenda. : calculated Young’s modulus.