{"id":4805,"date":"2013-04-12T06:08:52","date_gmt":"2013-04-12T06:08:52","guid":{"rendered":"http:\/\/lafeber.com\/pet-birds\/?p=4805"},"modified":"2025-07-31T19:14:25","modified_gmt":"2025-08-01T00:14:25","slug":"why-birds-eye-are-so-different-from-ours","status":"publish","type":"post","link":"https:\/\/lafeber.com\/pet-birds\/why-birds-eye-are-so-different-from-ours\/","title":{"rendered":"Why Birds&#8217; Eyes Are So Different From Ours"},"content":{"rendered":"<figure id=\"attachment_43928\" aria-describedby=\"caption-attachment-43928\" style=\"width: 300px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-43928\" src=\"https:\/\/lafeber.com\/pet-birds\/wp-content\/uploads\/2013\/04\/yellow-crowned-amazon-px-9099001-300x300.jpg\" alt=\"yellow-crowned amazon (aka yellow-fronted amazon) close up on head to show beak and eye\" width=\"300\" height=\"300\" srcset=\"https:\/\/lafeber.com\/pet-birds\/wp-content\/uploads\/2013\/04\/yellow-crowned-amazon-px-9099001-300x300.jpg 300w, https:\/\/lafeber.com\/pet-birds\/wp-content\/uploads\/2013\/04\/yellow-crowned-amazon-px-9099001-100x100.jpg 100w, https:\/\/lafeber.com\/pet-birds\/wp-content\/uploads\/2013\/04\/yellow-crowned-amazon-px-9099001-768x768.jpg 768w, https:\/\/lafeber.com\/pet-birds\/wp-content\/uploads\/2013\/04\/yellow-crowned-amazon-px-9099001.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><figcaption id=\"caption-attachment-43928\" class=\"wp-caption-text\">Photo by <a href=\"https:\/\/pixabay.com\/photos\/parrot-bird-feathers-macaw-plumage-9099001\/\" target=\"_blank\" rel=\"noopener\">David Clode\/Pixabay<\/a><\/figcaption><\/figure>\n<p>Birds are highly visual animals with unique features and adaptations that allow them to fly. As they begin to migrate, they use visual cues to help guide them. Their eyes can change focus rapidly using an active process called accommodation. Birds also see ultraviolet light, and they have enhanced visual acuity because of different mechanisms, including a one-to-one projection of receptor cells to ganglion cells in the retina.<\/p>\n<h2>Avian Ocular Anatomy &amp; Physiology<\/h2>\n<p>Birds are the most visually dependent class of vertebrates. Even though humans are highly visual, the information transmitted to our brains is only 40 percent of that transmitted by pigeons and chickens. Birds of prey have even greater visual acuity. Pigeons can discern subtle color differences, and other avian species are able to record and remember over 6,000 images of caches where food is stored.<\/p>\n<p>Eye position in birds can be lateral in the skull or directed frontally, particularly in predator species such as raptors. Species with laterally placed eyes, such as <a href=\"https:\/\/lafeber.com\/pet-birds\/species\/parrot\/\">parrots<\/a>, have a larger visual field (300<sup>o<\/sup> for pigeons) versus frontally directed eyes (150<sup>o<\/sup> for barn owls). However, as the visual field increases, binocular vision decreases. In binocular vision, both eyes focus on the same object, and eye movement is coordinated. Monocular vision occurs when only one eye is focused on one object at any particular moment. That type of vision is the norm for our parrots.<\/p>\n<p>The eyeball consists of the small anterior cornea, a variable intermediate region, characterized by scleral ossicles and the posterior sclera. These sclera ossicles provide the rigid shape to the eyes of birds, which is not the way mammal eyes get their shape. \u00a0Types of eyeballs include:<\/p>\n<ul>\n<li>Flat eyeball \u2014 diurnal birds (active during the daytime) with narrow heads; a short bulbar axis results in a small visual image on the retina and lessened visual acuity.<\/li>\n<li>Globular eye \u2014 diurnal birds with wider heads, including passeriforms, most parrots and birds of prey; a cone-shaped intermediate region results in greater visual acuity<\/li>\n<li>Tubular eye \u2014 nocturnal birds of prey; the intermediate region is relatively elongated.<\/li>\n<\/ul>\n<p>The shape of the avian retina is relatively flat, meaning that its surface lies near the point of focus for all directions of incident light. The wall of the eyeball consists of:<\/p>\n<ul>\n<li>Outer fibrous tunic \u2014 cornea and sclera<\/li>\n<li>Middle layer \u2014 vascular layer<\/li>\n<li>Inner layer \u2014 nervous (retinal) layer<\/li>\n<\/ul>\n<h2>Fibrous Tunic<\/h2>\n<p>The outermost layer, or fibrous tunic, maintains the shape of the eye. The cornea is relatively small, particularly in underwater swimmers. It is strongly curved in tubular and globular eyes. The refractive index between the air and the cornea is relatively larger compared with that between the water and cornea, and is nearly the same underwater.<\/p>\n<p>The sclera in birds is reinforced with a continuous layer of hyaline cartilage, except at the scleral ossicles. These ossicles form a continuous ring of overlapping bones that support and form a base of attachment for the ciliary muscles. Mammals maintain their eye pressure with the fluid that is made internally. Birds also make fluid in their eyes, and this fluid is drained out by the scleral venous sinus, or canal of Schlemm. This sinus is at the sclerocorneal junction or limbus of they eye, and it needs to stay open to drain fluid or it will cause an increase in pressure like in mammals that get glaucoma.<\/p>\n<h2>Vascular Tunic<\/h2>\n<p>The middle layer of the eye consists of a continuous layer \u2014 the vascular tunic. It is composed of the choroid, ciliary body and iris. The choroid tends to be thick, highly vascular and darkly pigmented, and it provides a significant portion of the nutrition to the eye. The tapetum lucidum, a highly reflective surface in many species, has been observed in only a few species of birds \u2014 the goatsuckers, which are nocturnal. The choroid continues as the ciliary body and then the iris.<\/p>\n<p>The ciliary body suspends the lens with its processes, the ciliary processes and its fibers, the zonular fibers that encircle the lens. The ciliary processes are pressed firmly against the lens with its muscles that provide accommodation. These muscles are striated in birds, and they are directly attached to the lens capsule. This unique feature allows birds to rapidly adjust their vision as they fly. These muscles are most highly developed in hawks because they require rapid accommodation as they descend in a dive to hit their prey target with great accuracy.<\/p>\n<p>Accommodation is much different in birds compared with mammals. In mammals, the ciliary muscles result in a passive change of the thickness of the lens. Birds, however, use a variety of active mechanisms for accommodation of the lens. These mechanisms include:<\/p>\n<ul>\n<li>Using the posterior sclerocorneal muscle to force the ciliary body actively against the lens to change its shape<\/li>\n<li>Using the anterior sclerocorneal muscles to distort the center of the cornea (hawks, owls)<\/li>\n<li>Having a softer lens with powerful sclerocorneal muscles to force the lens to bulge through the pupil (diving birds). Water reduces vision because there is no longer corneal refraction, which accounts for 20 diopters.<\/li>\n<\/ul>\n<p>The iris is often dark but may be highly colored. Male <a href=\"https:\/\/lafeber.com\/pet-birds\/species\/cockatoo\/\">cockatoos<\/a> often have a black iris, while females have a brown one.<\/p>\n<p>The pupil is commonly rounded; pupils with an irregular margin may result from avian leukosis. Pupillary size is regulated by striated, rather than smooth muscles \u2014 the sphincter and dilator muscles of the pupil. Movement and size are rapidly changed in birds, but because of willful movement, a bird\u2019s pupils often not respond to light in a pupillary exam because of stress. Birds also have the ability to regulate the quantity of light reaching the retina by migration of pigment in special cells embedded into the retina. With light adaptation, the pigment migrates to shield the receptor cells.<\/p>\n<h2>Lens<\/h2>\n<p>As indicated, the lens of birds is softer than that of mammals to provide rapid accommodation. Part of this softness results from the lens vesicle, which is fluid-filled. It lies between the annular pad (Ringwulst) and the body of the lens. The annular pad encircles the equator of the lens and is most pronounced in diurnal predators. In primates, the lens filters light below 400 nm, making it impossible to detect ultraviolet light. On the other hand, birds are able to visualize wavelengths down to 350 nm, allowing them to visualize many things we cannot. They are able to discern males from females in what we think are sexually monomorphic species. They can detect ripeness of food items because of this quality and hawks can visualize urine trails of mice. Now that is something very different than mammals and provides them with unique abilities to see things that we cannot see.<\/p>\n<h2>Retina<\/h2>\n<p>The retina of birds is relatively thickened and does not contain blood vessels, as occurs in mammals. This allows the entire space to pack in more \u201cpixels\u201d to see with. The retina consists of a non-nervous pigmented epithelium and a nervous layer composed of rods, cones, bipolar cells and ganglion cells. The ganglion cells collect to form the optic nerve at the optic or blind spot.<\/p>\n<p>The rods and cones are the receptors in the retina. Rods are sensitive to the intensity of light, so nocturnal birds have mostly rods. In order to increase sensitivity to low amounts of light, several rods synapse with a single bipolar cell and several bipolar cells synapse with a single ganglion cell. However, the sensitivity of the owl\u2019s eye may be due to its ability to gather more light (2\u00bd times brighter than humans). Their ability to hunt in near darkness may result from their sense of hearing.<\/p>\n<p>Cones are responsible for visual acuity and color vision. In diurnal passerines and predators, one cone synapses with a single bipolar cell, which synapses with a single ganglion cell. This one-to-one projection to the brain greatly enhances visual acuity, or the sharpness of detail.<\/p>\n<p>Factors that affect visual acuity include:<\/p>\n<ul>\n<li>Relatively large eye<\/li>\n<li>Accuracy of focus on the regions of the retina because of the shape of the eye (ie, tubular)<\/li>\n<li>Magnifying capacity of the fovea<\/li>\n<li>Absence of blood vessels<\/li>\n<li>The visual acuity or one-to-one projection of receptor cells to ganglion cells<\/li>\n<li>Amount of contrast between an object and its background<\/li>\n<\/ul>\n<p>The central area of the retina is the place of maximal optical resolution and may have a fovea. This fovea is commonly deeper than that of primates, thereby increasing visual acuity. The fovea may have one of three arrangements:<\/p>\n<ul>\n<li>A single, round central area in each eye, close to the optic axis. A horizontal central area is present in water birds and those that live in open plains, which allows the eye to fix the horizon at its reference point.<\/li>\n<li>Two foveate areas \u2014 one in the central area and a laterally situated temporal one. This is common in fast-moving birds, which require accurate perception of distance at relatively high speeds.<\/li>\n<li>A single foveate area temporally placed, as in owls.<\/li>\n<\/ul>\n<h2>Color Vision<\/h2>\n<p>There are three visual pigments in birds, with a possible fourth, that are sensitive to near ultraviolet wavelengths. In birds, cones additionally have an oil droplet within them with five different absorbency spectra. The droplets\u2019 function is not entirely known, but they may directly produce color vision or may enhance contrast by acting as intraocular filters. For example, yellow droplets could remove much of the blue from the background, increasing contrast between an object and the blue sky.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Enhanced visual acuity, seeing ultraviolet light, and changing focus rapidly are some of the fascinating abilities of birds&#8217; eyes.<\/p>\n","protected":false},"author":7,"featured_media":43928,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[95],"tags":[],"class_list":["post-4805","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-health"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why Birds&#039; Eyes Are So Different From Ours &#8211; Pet Birds by Lafeber Co.<\/title>\n<meta name=\"description\" content=\"Enhanced visual acuity, seeing ultraviolet light, and changing focus rapidly are some of the fascinating abilities of birds&#039; 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ABVP (Avian), Dipl. ECZM (Avian),\u00a0\u00a0received her Ph.D, in human neuroanatomy from the University of Cincinnati, College of Medicine and her DVM degree from Ohio State University. She is a board-certified specialist in avian medicine and surgery, both in the United States (ABVP, Avian) and in Europe (ECZM, Avian). She is known internationally through the advances made for the health care of birds, books and articles she has written, and her lectures to veterinarians and bird owners alike. After practicing in California, she went on to become a faculty member of the University of Tennessee, College of Veterinary Medicine from 1986 to 2000, where she taught avian medicine and surgery to veterinary students and residents. While there, she developed the Avian, Exotic Animal and Wildlife Service in the Veterinary Teaching Hospital and an avian residency program leading to board certification in avian medicine through ABVP. 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ABVP (Avian), Dipl. ECZM (Avian),\u00a0\u00a0received her Ph.D, in human neuroanatomy from the University of Cincinnati, College of Medicine and her DVM degree from Ohio State University. She is a board-certified specialist in avian medicine and surgery, both in the United States (ABVP, Avian) and in Europe (ECZM, Avian). She is known internationally through the advances made for the health care of birds, books and articles she has written, and her lectures to veterinarians and bird owners alike. After practicing in California, she went on to become a faculty member of the University of Tennessee, College of Veterinary Medicine from 1986 to 2000, where she taught avian medicine and surgery to veterinary students and residents. While there, she developed the Avian, Exotic Animal and Wildlife Service in the Veterinary Teaching Hospital and an avian residency program leading to board certification in avian medicine through ABVP. This service was recognized for having the largest caseload of exotic animals at any American veterinary teaching hospital. She has a number of areas of concentration including avian nutrition, anatomy, fungal diseases, neuroanatomy and herbal medicine.\u00a0\u00a0She consults for the Lafeber Company as needed. Dr. Orosz\u00a0is past president of the Association of Avian Veterinarians (AAV),\u00a0 has been a scientific editor for the\u00a0Journal of Avian\u00a0Medicine and Surgery and a recipient of the Dr. T.J. Lafeber Avian Practitioner of the Year award.\u00a0 She\u00a0is owner of Bird and Exotic Pet Wellness Center, an exclusively exotics veterinary hospital in Toledo, Ohio.","sameAs":["http:\/\/lafeber.com\/pet-birds\/about-susan-orosz\/"],"url":"https:\/\/lafeber.com\/pet-birds\/author\/susan\/"}]}},"_links":{"self":[{"href":"https:\/\/lafeber.com\/pet-birds\/wp-json\/wp\/v2\/posts\/4805","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lafeber.com\/pet-birds\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lafeber.com\/pet-birds\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lafeber.com\/pet-birds\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/lafeber.com\/pet-birds\/wp-json\/wp\/v2\/comments?post=4805"}],"version-history":[{"count":2,"href":"https:\/\/lafeber.com\/pet-birds\/wp-json\/wp\/v2\/posts\/4805\/revisions"}],"predecessor-version":[{"id":43930,"href":"https:\/\/lafeber.com\/pet-birds\/wp-json\/wp\/v2\/posts\/4805\/revisions\/43930"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lafeber.com\/pet-birds\/wp-json\/wp\/v2\/media\/43928"}],"wp:attachment":[{"href":"https:\/\/lafeber.com\/pet-birds\/wp-json\/wp\/v2\/media?parent=4805"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lafeber.com\/pet-birds\/wp-json\/wp\/v2\/categories?post=4805"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lafeber.com\/pet-birds\/wp-json\/wp\/v2\/tags?post=4805"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}