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Figure 4


Fig. 4. Photorefractive images of a young (3 years old) harbour seal under water axially refracted with lateral (A) and frontal camera position (B) and an older (12 years old) harbour seal under water (C) and in air (D). On the underwater pictures (A–C), two rings in the centre and one pronounced ring in the periphery can be seen. Corneal cloudiness in the older seal leads to a central stripe in the brightness distribution under water (C), and irregularities in corneal topography to spot-like distortions in air (D) that mask the slightly visible rings.





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