Huvitz CRK-1, Руководство по обслуживанию, Страница: 85 / 88

84 Auto Ref/Keratometer CRK-1 ------------------------------------------------------------------------------------------------
ajor and minor meridian is displayed as +CYL.
MIX : “-“ sign will be attached in the case of the myopic astigmatism whereas, “+” sign
in the case of the hyperoptic astigmatism.
The above-mentioned option can be chose in ‘User Setup Mode’
(4) Axis
Axis is expressed counterclockwise from the ear side of the left eye as the origin shown
in the figure below.
(5) Pupil Distance (PD)
Pupillary distance (PD) is the distance between the centers of the lenses of glasses.
Conveniently, it is said that the distance between the pupils is the distance between the center
of two lens.
Average PD of Korean people is about 62 or 63mm for men and about 60mm for woman.
L R