Tomey TMS-5, Instruction Manual

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3-78
b) Application formatp
Fourier Map
The index is calculated by conducting Fourier analysis for
the axial power data.
.
● Spherical (Spherical eq.):
Spherical component of corneal refractive power
Equivalent to the constant term in Fourier analysis:
Unit [D]
● Reg. Astig. (Regular Astigmatism):
Regular astigmatism component of corneal refractive
power
Equivalent to the second order term in Fourier analysis:
Unit [D]
● Reg. Astig. axis:
Axis angle of regular astigmatism component of corneal
refractive power. Unit [°]
● Asymmetry:
Asymmetry component of corneal refractive power
Equivalent to the first order term in Fourier analysis:
Unit [D]
(Fig. 1)