PRK-8000 Operation Manual
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5.5 Peripheral Keratometry [K(P) Mode]
In K(P) Mode, peripheral corneal curvatures can be measured by having the examinee look
at the peripheral eye fixation lamps. Measuring the corneal periphery will help you examine
irregular astigmatism, and also determine a better fitting for a contact lens.
There are two modes for lighting the peripheral eye fixation lamps:
AUTO Mode: After measuring the center of cornea, four peripheral eye fixation lamps
light automatically in turn according to the corneal astigmatism axis.
MANU Mode: Peripheral eye fixation lamp to be lit can be selected from eight positions
by pressing the touch screen.
When you enter this mode after measuring the center of cornea in K/R or KER Mode, or if
you measure the center first after entering this mode, you will automatically enter AUTO
Mode first.
(1) Enter K(P) Mode.
Press MODE button on the left side of the display, and then select “K(P)”.
(2) Follow the same procedure (2) and (3) of the Continuous Keratometry and
Refractometry [K/R Mode].
Have the examinee look at the lit peripheral eye fixation lamp. Blinking circle on the
monitor show the lamp at the examinee’s side is lit in order to make measurement.
Looking at the monitor, align the mire image and alignment mark, and focus on the mire
image by using the operation lever.
(3) Measurement
After ensuring that the positioning and focusing are proper, press measuring button .
[AUTO Mode]
After each measurement, the target at the position to be measured next blinks
automatically on the monitor. Each time, have the examinee look at the lamp, perform
alignment and focusing, and then measure.
If the center area has not been measured yet, the target on the left side of the word
“CEN” on the monitor will be blink. Have the examinee look at the red roof in the center
of the scenery, and measure.
If “ERR” is displayed as a result of measuring the center, peripheral eye fixation lamp
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