Monday, May 22, 2006

22

Refractive/Axial Myopia and Hyperopia


Refractive Myopia: occurs when the power of the eye exceeds 60D and the length of the eye is 22.6mm. This is due to steeper corneal curvatures or higher lenticular powers.


Axial Myopia: occurswhen the power of the eye is 60D but the eye is longer than 22.6mm. Every millimeter of axial elongation causes approximately 3D of myopia.


Refractive Hyperopia: occurs when the power of the eye is less than 60D and the length of the eye is 22.6mm.


Axial Hyperopia: occurs when the power of the eye is 60D but the eye is shorter than 22.6mm.



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