الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Transparency is one of the most important characteristics of the healthy cornea. Assessment of corneal transparency is an essential part of the ophthalmologic examination. This assessment is frequently performed by a routine, slit-lamp examination, which is subjective. Objective measurement of corneal transparency improves patient management byproviding early diagnosis of corneal pathologies and monitoring healing or disease progression.
A number of imaging techniques have been used for measuring backward scattering of light to assess corneal transparency The Pentacam Scheimpfug analysis system (Oculus, Wetzlar) is a relatively new method for assessing the characteristics of corneal light backscattering and for quantifying corneal transparency. It measures corneal backscattered light over a 12-mm-diameter area and provides corneal optical density (COD) measurements in 4 annular zones and 3 layers. The system automatically gives numerical values for theCOD, allowing quantitative measurement of the clarity and health of the cornea. The densitometry program analyzes the zonal COD in the 4 annular concentric zones centered in the apex of the cornea (0–2 mm, 2–6 mm, 6–10 mm, and 10–12 mm in diameter). The analysis is also performed by depth in 3 layers of the cornea: the anterior layer (anterior 120 μm), central layer (from the frst 120 μm to the posterior 60 μm), and posterior layer (posterior 60 μm). The densitometry values are expressed in grayscale units (GSU), ranging from zero (minimum light scatter, meaning maximum transparency) to 100 (maximum light scatter, meaning total opacity).
The aim of this study is to investigate corneal densitometry values obtained using Scheimpflug tomography in low myopic and highly myopic (HM) eyes and to assess the differences in densitometry values between them, and to investigate the imaging capabilities of Pentacam in patients with High Myopia.