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Scintigraphy image of a novel ion-sensitive hydrogel based on gellan gum and kappa-carrageenan. In the upper images (control eye), the signal decreases in the corneal surface, moving towards the nasolacrimal duct, while in the bottom images, signal obtained in the eye with hydrogel remains unchanged. Reproduced with permission from [51], published by Elsevier, 2017.
