This means that more pixels into the small area available in the sensory fovea help them to essentially zoom in on their prey like a rabbit in bushes from 10,000 feet up. Human photoreceptors (especially cones) are separated by 3µm, whereas it is 2 µm in case of an eagle. (3)īased upon ophthalmoscopic measurement, the maximum anatomical resolving power of the eagle’s deep fovea was calculated as 140 c/deg and Maximum behavioural acuity between 132 and 143 c/deg, which corresponds closely and gathers highest form of visual information while perching. (2) In spite of 30-degree separation of their eyes from the midline of their face (1), the extra fovea allows them to obtain a high-resolution field of view to the side of their heads as well as directly in front of them. The deep fovea allows these birds to perceive distant objects, specifically to identify prey. One shallow fovea maneuvered in their binocular vision, and a deep fovea for monocular vision. Amid the queer trait of their biological vision, they have two types of foveae. The word “Refuge” conjures up the image of something hefty, and dynamic and this title perfectly aligns with the image of an EAGLE, a proud family member of Accipitridae, (1) who solicited this title for its own fascinating visual calibre.Īn eagle is blessed with a bewildering vision of 5/20 to 4/20, which is almost four to five times better than humans. Humans have been blessed with the highest form of sensory development, but some lower carnivores eclipse human abilities in certain aspects. Sankhajyoti Saha, M.Optom Editorial Assistant, Vision Science Academy Assistant Professor, NSHM Knowledge Campus, Kolkata, India
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