Intensity of the one-eye opacity symptomatology at discovery in five categories, depending on the degree of opacity of the cornea, from small-scale opacity, where the iris and pupil are entirely sharp recognizable (state 1, left) to a complete clouding of the cornea, where the iris and pupil are no longer clearly visible (state 5, right) (Picture Copyright: Waldrappteam, LIFE Northern Bald Ibis)

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