In the inner part of the eye's optic nerve head, collagen-breaking enzymes caused a 57% drop in stiffness compared to normal.

After damaging the inner optic nerve head tissue with enzymes, adding saline solution slightly increased stiffness by about 13% compared to the damaged state.

After damaging the inner optic nerve head tissue with enzymes, the special peptide restored stiffness by nearly 50% compared to the damaged state.

When rats' eye tissue was treated with an enzyme that breaks down collagen, the stiffness of the outer part of the eye decreased by almost 40% compared to normal.