الفهرس 
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Abstract
Myopia is the condition of refraction in which parallel rays of light are come to be focused infront of the retina of a resting eye . Myopia is measured by the spherical power of the diverging lens that focus the image on the retina.1
Myopia is one of the most common conditions in the eye and is one of the leading causes of vision impairment all over the world.2
The number of people with myopia is increasing lately, there are many visual signicant sequella increases in relation to greater degrees of myopia, The term of high myopia is used to refer to eyes with greater than -6 diopters (D) of spherical refractive error. High myopic patients have decreased quality of life in comparison with those with no or lesser amounts of myopia.3
High myopia is characterized by progressive elongation of the globe, that result in many secondary fundus changes that themselves may cause visual impairment which includes retinal detachment, myopic macular schisis macular hole, choroidal neovascularization, and zonal areas of chorioretinal atrophy. 3-4
Even in eyes with no observable macular pathology, there is decrease in visual function in high myopic eyes with increasing age. This decrease in visual function with age progress is not limited to decreased visual acuity but also includes decreased threshold visual field sensitivity and electrooculography and multifocal electroretinography results.5-7
The mechanisms of pathology for this decreased visual acuity with no macular changes have not been explained for eyes with high myopia.6
There are many structural alterations induced by high myopia may be imaged and assessed by spectral domain optical coherence tomography (OCT).9