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Code
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Display
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Definition
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111940
|
Corneal axial power map |
A two dimensional representation of the axial curvature of the cornea. Axial curvature is calculated from the reciprocal of the distance from a point on a meridian normal at the point to the corneal topographer axis. Also known as sagittal curvature. |
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111941
|
Corneal instantaneous power map |
A two dimensional representation of the instantaneous curvature of the cornea. Instantaneous curvature is calculated from the reciprocal of the distance from a point on a meridian normal at the point to the center of curvature of that point. Also called tangential curvature. |
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111942
|
Corneal refractive power map |
A two dimensional representation of the refractive power of the cornea. Corneal refractive power is calculated using Snell's Law. |
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111943
|
Corneal elevation map |
A two dimensional representation of the elevation of the cornea. Elevation is calculated as the distance from a point on the corneal surface to a point on a reference surface along a line parallel to the corneal topographer axis. For the purpose of visualization the reference surface is usually a sphere or an ellipse. |
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111944
|
Corneal wavefront map |
A two dimensional representation of a wavefront aberration surface of the cornea. Wavefront aberration surface is calculated from the corneal elevation data fit with either the Zernike polynomial series or the Fourier Series. Maps generally display total aberrations and selectable higher order aberrations. |