Variable
[FIAPower Post 3mm]
HigherOrder
Definition
Fourier Index Axial Power of the central 3mm of
the posterior corneal surface calculating the
higher order irregular astigmatism component
obtained by constant, first and second order terms.
instantaneousanterior_pr1_3mm_d The relative keratometric progression (using 1.376
as refractive index) from the PI1 3 mm towards the
corneal apex in the instantaneous (local corneal
curvature) map of the anterior corneal surface
instantaneousker_pr1_3mm_d
The relative keratometric progression (using
1.3375 as refractive index) from the PI1 3 mm
towards the corneal apex in the instantaneous
(local corneal curvature) map of the anterior
corneal surface
elevationposterior_p3dif
Difference in posterior elevation between PI3 to
apex and cPI3 to apex
elevationposterior_p3avg_dif
Difference in posterior elevation in the area of 1
mm radius around PI3 and cPI3
instantaneousreal_pr1_3mm_d
The relative keratometric progression (with
adding correction of corneal thickness) from the
PI1 3 mm towards the corneal apex in the
instantaneous (local corneal curvature) map of the
anterior and posteror corneal surface
[FIAPower Post 3mm] Asymmetry Fourier Index Axial Power of the central 3mm of
the posterior corneal surface representing the
point where the largest refractive power is
directed 180° relative to point of the smallest
refractive power
elevationanterior_p3dif
Difference in anterior elevation between PI3 to
apex and cPI3 to apex
Refractive power of the anterior and posterior
[Real(Total) Index] Kf
cornea at the flat meridian, analogue to the K1
value obtained by the Pentacam
Absolute maximum value of refractive power
[Refractive Keratometric]_P1aValue
(focus difference is obtained using Snells law
instead of paraxial calculation; 1.3375 is used as
refractive index) in the lower hemisphere
Absolute maximimum height of the posterior
[Height Posterior]_P1aValue
cornea in the lower hemisphere, in mikrometers
Absolute height of the posterior cornea in the
[Height Posterior]_P3aValue
lower hemisphere at the point of maximum
posterior elevation, in mikrometers
Absolute height of the posterior cornea in the
[Height Posterior]_P4aValue
lower hemisphere at the point of thinnest
pachymetry, in mikrometers
Difference in refractive power of the anterior and
axialreal_p4avg_dif
posterior cornea 1mm around the point of thinnest
pachymetry in the lower hemisphere and it’s cPI
Average height of the posterior cornea in the lower
[Height Posterior]_P3a_Avg
hemisphere 1mm around the point of maximum
[Elevation Posterior]_P4b_value
[Elevation Posterior]_P4a_Avg
heightanterior_pr_1a_1mm
posterior elevation, in mikrometers
Absolute maximum value of posterior elevation in
the upper hemisphere (cPI) at the point of
maximum posterior axial power
Average value of posterior elevation in the lower
hemisphere 1 mm radius around the point of
maximum posterior axial power
Maximum anterior height in the lower hemisphere
1 mm towards the corneal apex
heightposterior_pr_1a_1mm
Maximum posterior height in the lower
hemisphere 1 mm towards the corneal apex
heightposterior_pr4_2mm_d
The difference in posterior height at the thinnest
pachymetry in the lower hemisphere and the value
2 mm towards the corneal apex
Difference in maximum refractive power (focus
difference is obtained using Snells law instead of
paraxial calculation; 1.3375 is used as refractive
index) and the value 1 mm towards the corneal
apex
refractivekeratometric_pr1_1mm_d