Tomey TMS-5, Instruction Manual

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Refractive Power The refractive power on this map is the true refractive
power, regarding the cornea as a lens. The true optical
power is calculated not by paraxial calculation but by
Snell's law. For example, when capturing an image of
the spherical model eye, the refractive power of the
surrounding area is larger than that of the center. This
shows the spherical aberration. The refractive power map
is suitable for evaluating the optical characteristics of a
cornea including aberration and/or image quality caused
by the corneal refractive power.
[Keratometric]
This is the conventional refractive map of TMS.
Similar to “Axial Power [Keratometric],” 1.3375 is used
for the cornea equivalent refractive index.
(Fig. 1)
(Fig. 2)