. The eyes of the burrowing owl [microform] : with special reference to the fundus oculi. Chouette des terriers; Burrowing owl; Vision; Vision; Oiseaux; Birds. Sai THE EYES OF THE BURROWING OWL is in birds with a single fovea placed above and towards the nasal aspect of the optic nerve entrance. The owls possess a single, deep fovea encircled by a round, sharply defined area located above and on the temporal side of the optic disk. This arrangement closely approaches the binocular macule of man. The writer gives to the owls a class by itself in describing these ares and affirms that the tempor
. The eyes of the burrowing owl [microform] : with special reference to the fundus oculi. Chouette des terriers; Burrowing owl; Vision; Vision; Oiseaux; Birds. Sai THE EYES OF THE BURROWING OWL is in birds with a single fovea placed above and towards the nasal aspect of the optic nerve entrance. The owls possess a single, deep fovea encircled by a round, sharply defined area located above and on the temporal side of the optic disk. This arrangement closely approaches the binocular macule of man. The writer gives to the owls a class by itself in describing these ares and affirms that the temporal monomacular fundus is found almost exclusively in the owls. In conjunction with Arthur W. Head, F. Z. S., the South Ameri- can Burrowing Owls in the London Zoological Gardens were closely studied and examined with the ophthalmoscope. In addition, the interior of the eyeball , both of that type and ofseveral North Amer- ican individuals were examined by the writer in prepared specimens. The ophthalmo- scope in particular shows the fundus oculi of Speolyto cuntcu/ario to be that of a typical nocturnal animal. The picture of this bird's background is well shown in the accompanying colored plate, painted by Head and faithfully reproduced here. The ocular fundus of this species is irregularly round, as in all the owls, and in prepared specimens these details show distinctly. The single, temporal, oval macular region lies above and about a disk length and a half from the upper end of the papilla. In the center of the macula is the fovea—a dark pigmented spot with fine granules arranged cap-like above it. Outside this, again, is the ovoid circumference of this region, incompletely edged with fine dots. These are more numerously distributed below the macula than above it. Connected with the macular region is a light-colored and rather broad band that extends horizontally to the center of the visible background. It is unevenly divided into two strips by a parallel arrangement of mi
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Photo credit: © The Book Worm / Alamy / Afripics
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbirds, booksubjectvis
