Topcon KR-1W - Page 109

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DISPLAYING THE MEASUREMENT RESULT
DISPLAY OF DIRECTION
The direction is defined as follows.
Element Example Definition of direction Range of angle
Trefoil
Shown by the angle of blue
area (direction where wave-
front is late).
90° when blue area is higher.
0-120
Coma
Shown by the angle of red area
(direction where wave-front is
advanced).
90° when red area is higher.
0-360
Tetrafoil
Shown by the angle of blue
area (direction where wave-
front is late).
90° when blue area is higher.
0-90
2
nd
Astig
Shown by the angle of red area
(direction where wave-front is
advanced).
90° when red area is higher.
0-180