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Analysis and application of corneal morphological parameters

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The corneal morphology of the normal population is an aspheric surface. The cornea is gradually flat from the center to the periphery, and the whole is oblong oval. In clinical work, we will see various parameters that describe corneal morphology, such as Ecc value ( e value ), E value, p value, Q value ( Figure 1 ).


Analysis and application of corneal morphological parameters



Fig. 1 (DEA520 Corneal Topographer-Shape Factor )


Analysis and application of corneal morphological parameters



e value (Ecc value): also known as eccentricity,describes the change in curvature of the cornea from central to peripheral. Itis mainly used in the corneal contact lenses fitting. 


Analysis and application of corneal morphological parameters



Q value (p-1): also known as asphericity parameter, it describes the trend of corneal curvature from central to peripheral. It is mainly used in the design of aspheric IOL facets and personalized refractive surgery.


Analysis and application of corneal morphological parameters

Analysis and application of corneal morphological parameters




Fig. 2 (DEA520 Corneal Topographer-Aberration )

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