These findings may indicate that the viscoelastic properties of the cornea are altered to a minor extent in myopia. However, in this normal population, any overall systematic changes in CH and CRF with refractive error were small in comparison with the considerable inter-subject scatter at any level of refraction.

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Binocular vision we call the combined use of the two eyes to create a single and unique brain impression [1][2][3]. Essentially, it is the set of brain processes that result in the integration of the two retinal images and therefore in their perception as one.When we see binocular, then, an object in front of us is formed by an image in the central well of each retina, resulting in the formation of an image in each eye. These two images are transmitted via the visual pathways to the cerebral venous lobe, are sensory integrated and perceived as one.Binocular vision, developed and practiced during the first years of life, gives us an important advantage, the ability to see and observe space in three dimensions, that is, it gives us a sense of depth. This ability is called "stereoscopic vision". Other benefits of binocular vision are the widening of the field of vision, as well as an increase in visual acuity, which is slightly better than single-eyed. Binocular Vision GradesClaude Worth has classified binocular vision into three grades:a) First-degree binocular vision is the "simultaneous perception" of the two retinal images, but not necessarily their integration into one. b) Second-degree binocular vision is the ability to integrate two similar retinal images, that is, their sensory "identification". c)Third degree binocular vision is stereoscopic vision or stereopsis Stereo VisionStereoscopic vision is called the ability to classify objects we see in the 3D world. Essentially is the ability to estimate depth [1,[4][5][6][7]]. An object, located in the middle line in front of the eyes, forms slightly dissimilar images on each retina, on each eye. This is due to the transverse distance, so each eye sees the object from a different location. If the object is within the bounds of Panum's space, that is, the area that extends forward and behind the chopper and within which a single binocular vision is possible, then the images, although dissimilar, may be subjected to sensory identification.This matching of the two dissimilar images leads to the perception of the third dimension, stereoscopic vision and therefore depth [1].An object looks flat because it is projected to the corresponding retinal areas causing zero horizontal inequality. The non-zero difference creates the stereoscopic depth and is divided into split and nonlinear [4]. The split is created by the objects in front of the horopter, that is, by the nearby objects. This is called as, the oneeyed image of the object observed with the right eye is moved to

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