Which bird has a brain smaller than either of its eyeballs

Fovea, which is the area of the highest visual acuity, is the carrier of Principle Visual direction and is the center to which the secondary visual direction of the other retinal element relates. This direction is relative to the visual direction of the fovea. Thus each retinal element when stimulated localizes the stimulus as a visual percept in a specific direction вЂ“ a visual direction.This direction in which the visual object is localized is determined by the directional or spatial values of the stimulated retinal element called the Local signs of Lotze which is an intrinsic property inherent in the retinal element. The retinal area when stimulated by light entering the eye from an object is perceived not only as being of certain brightness, color and certain form, but also has a certain direction in visual space.It is defined as a retinocerebral apparatus engaged in elaborating a sensation in response to excitation of a unit area of retinal surface. The objective lines of direction determine which retinal area will be stimulated, their subjective counterpart, the visual direction determines the direction in which the object will be seen in visual space. Location of an object point in physical space was separated from its localization in visual space. Objective (Physical) & Subjective (Visual) space The objects in space are localized by us in two ways вЂ“one is relative to one another and is called relative localization and the other is in relation to ourselves and is called egocentric localization. Compensation for blind spot and other differences.In addition to single vision it results in stereopsis вЂ“ the most precise kind of depth perception.The first and the foremost advantage of a binocular vision is single vision.The advantages of a Binocular vision are: The precise co-ordination of the two eyes for all direction of gazes, so that corresponding retino-cortical element are placed in a position to deal with two images i.e.The ability of the retino-cortical elements to function in association with each other to promote the fusion of two slightly dissimilar images i.e.

Clear Visual Axis leading to a reasonably clear vision in both eyes.A small manifest strabismus is therefore always present in anomalous Binocular Single vision. when the visual direction of the retinal elements has changed. Anomalous - Binocular Single vision is anomalous when the images of the fixated object are projected from the fovea of one eye and an extrafoveal area of the other eye i.e.Normal вЂ“ Binocular Single vision can be classified as normal when it is bifoveal and there is no manifest deviation.Thus binocular vision implies fusion, the blending of sight from the two eyes to form a single percept. Janureviewed for accuracy JanuIntroductionД«inocular Single Vision may be defined as the state of simultaneous vision, which is achieved by the coordinated use of both eyes, so that separate and slightly dissimilar images arising in each eye are appreciated as a single image by the process of fusion.

Which bird has a brain smaller than either of its eyeballs