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TERMINOLOGY
Term Description Page
REF/KRT measurement
mode
Measurement mode of simultaneous Ref & Kerato mea-
surement, single Ref measurement and single Kerato
measurement.
Since KR-1W calculates Ref measurement values from
Hartmann image, it can also perform analysis related to
ocular aberration. For analysis, pupil diameter is
required; Mire image can be obtained even by single Ref
measurement mode.
However, since only detection of pupil diameter is done
and detection of Mire ring is not done, analysis related to
cornea shape cannot be done.
For Kerato, as Kerato measurement values are calcu-
lated from Mire image, cornea shape can also be ana-
lyzed. Since Hartmann image is not obtained, analysis of
ocular aberration cannot be done.
49
R-L Travel Distance When measuring right/left eyes under auto alignment
measurement mode, KR-1W can set the distance of
movement from one eye to the other. "R-L Travel Dis
-
tance" means the travel distance, and it can be set
between 58mm and 74mm in 1mm unit.
139
RMS Short for Root Mean Square. Standard deviation of ideal
wavefront and actual wavefront. A unit for expressing
aberration quantitatively.
-
SA (Spherical Aberration) Short for Spherical Aberration.
4th order of Zernike polynominal equation, meaning
spherical aberration.
88
Scotopic Means dark place measurement. 68
Screen Layout Custom layout to select and display maps and RMS as
desired.
In KR-1W, screen layout can be prepared up to four
types.
142
Screen Shot Output Function to data-output analysis result screen. KR-1W
outputs the analysis result screen displayed in main body
in bit map style.
172
Serial measurement By continuously performing measurement for 10 shots at
a rate of 1 shot/1 sec., you can see the condition of aber
-
ration changing by elapsed time, such as dry eyes.
66
Sim-K Short for Simulated Aberration.
In KR-1W, the highest refractive power value at the
3mm position from cornea apex is expressed as Sim-Ks
and the lowest refractive power value as Sim-Kw.
Axis of Sim-Ks/Sim-Kw is called the Sim-K axis.
96
Sim-Ks Refractive power of the flat meridian of 3mm area of
Kerato analysis diameter.
83
Sim-Kw Refractive power of the steep meridian of 3mm area of
Kerato analysis diameter.
83
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