Figure 2.

(a) A crosslinked 7 mm sample swollen in PBS held on a corneal scalpel; (b) print lines ≈60 µm in width in the centre of a 7 mm sample imaged under microscope after printing; (c) a failed sample in which a hole was torn to exhibit the birefringence seen in the samples. (d) The transmission spectra of each of the 7 mm samples measured, cross points with error bars represent the average transmission and standard deviation at 10 nm intervals.