<prompt> True about adult cornea:Diameter is 10 mmDiameter is 12 mmDiameter is 14 minMicrocornea-diameter 10mm  <response>: D i.e. Microcornea - diameter less than 10 mm Horizontal diameter of cornea at bih is 10 mm and the adult size 11.7 mm is attained by the age of 2 years. Megalocornea is labeled when the horizontal diameter of cornea is of adult size at bih or 13 mm after the age of two yearsQ. In microcornea horizontal diameter is 10 mm since bihQ or 11mm in greatest dimension. Anatomical dimensions of Cornea Corneal diameter mm Radium of curvature mm Horizontal Veical Anterior surface Posterior surface 11.7 11.7 10.6 11.7 7.8 6.5 Corneal thickness Central Peripheral 0.5 - 0.6 1.2 