The estimated f-number suggests that the optical sensitivity of the Eubalaena australis eye is relatively low. By contrast, the dimensions of the cornea were only weakly correlated with body length. The regression analysis revealed a correlation between body length and eyeball size. We also observed variations in the abundance of periorbital fat among the adult specimens. We found that the eyes of the calves differed from those of the adults in having less periorbital fat surrounding the eyeball. To explore the sensitivity of the eye to light, the f-number was estimated in one specimen. We provide anatomical descriptions of the eyeball and extraocular structures, as well as quantitative data in the form of eyeball, corneal, scleral, and lens measurements.

Eye samples were collected from 26 calves, four adults with known body length, as well as two specimens of unknown body length that had stranded near their nursery ground at Península Valdés, Argentina, over 6 years. The aim of this study was describe the eye anatomy of the southern right whale (Eubalaena australis). However, much of the new information has been focused on odontocetes, and relatively little is known about the visual anatomy of baleen whales.

Recently, there has been a growing interest in the anatomy and optics of the visual system of cetaceans.

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