Abstract
Placido topographer CSO Phoenix had been used to measure 30 peoples corneas with astigmatism < 0.50 Dc (University of West Attica) and their refractive maps were taken. The refractive power map was used with measurements taken at the horizontal (180°), vertical (90°), and oblique axes (45° and 135°) for each of these 30 people. The keratometric measurements for > 5mm were recorded. The investigation took place at University of West Attica. The results showed that the shape of the cornea varies in the various meridians (e.g. 180° or 90°) and even with oblique meridians (e.g. in the nasal relative to the temporal side) and its curvature correlates with a different equation for each meridian.
Highlights
The cornea is an optically transparent, dome-shaped anatomic structure, with a slightly curved curvature than that of the sclera, giving the eye a slight tingling on the anterior surface
Taken the refractive powers for example as it is seen in Fig.8, firstly at 180° (46.78, 45.50, 44.65, 44.41, 45.12, 46.30) at 90 ° (45.86, 44.71, 44.09, 45.10, 46.07) at 45 ° (45.49, 45.51, 46.85) and at 135 ° (46.18, 45.47, 45.32) we tried to find using the best fitting curve equation that represents the curve that each meridian had according to the data selected
Using Placido topographer CSO Phoenix, 30 people (University of West Attica) were measured and refractive maps were taken from the corneas of those participants
Summary
The cornea is an optically transparent, dome-shaped anatomic structure, with a slightly curved curvature than that of the sclera, giving the eye a slight tingling on the anterior surface. It is the main refractive agent of the eye and is responsible for 2/3 of its total strength. The average values of its dimensions are as follows: Front surface radius Horizontal Diameter Center Thickness. 7.68 mm 11.8 mm 0.52 mm Peripheral Thickness 1.00 mm Histological the cornea consists of 6 layers of cells: the epithelium, the Bowman membrane, the layer, the Descemet membrane, the pre-Descemet membrane (Dua) and the endothelium [3],[4]
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