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621 The inferences of the paper refer to not only domestic cats (Felis domesticus), but the entire cat family (Felidae), as well as to many reptiles, amphib ian, and other animals. For the most part, these ani mals are predators that chase prey in the sunny day time and the absence of disturbing light flashes during their rapid chase is vital for them. For animals with round pupils, including humans, a comparatively large diffraction illumination of the retina from the sun is not as crucial in their living conditions; therefore, it has no disturbing effect on them. The vertical and horizontal resolutions of a narrow cat’s pupil would significantly differ if the optical sys tem of the eye were free of aberrations, i.e., were dif fractionally limited in these two directions; however, this is not the case (see, e.g., A. B. Bonds Optical Qual ity of the Living Cat Eye, J. Physiol. 243, 777–795 (1974) and references therein). In the vertical direc tion, for which the aperture is large, the resolution is determined by aberrations, whereas, for the horizontal direction (the aperture is small), it is mainly deter mined by diffraction; furthermore, both resolutions are comparable, with the second one being even higher. Therefore, it is highly questionable to consider the resolution to be an influencing factor for explain ing the shape and orientation of the cat’s pupil.

optics and spectroscopy

Reply to the comment by A. P. Grammatin on the paper “Cat’s pupil and apodization” by A. V. Lensky (Opt. Spektrosk. 107 (5), 814 (2009) [Opt. Spectrosc. 107 (5), 773 (2009)])