APPASAMY ASSOCIATES KMS 6, User Manual

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Seat the patient comfortably before the instrument. The chin should fit snugly into the chin
rest. It is necessary that the patient hold his head firmly against the headrest during the
examination. The patients should grasp the horizontal arm of the instrument thereby
providing a better support while proper fixation is being maintained. For the patient with an
extremely receding forehead or with deep-set eyes and a protruding forehead, it may be
necessary to adjust the forehead or chin rest. The adjustment on the keratometer body is
sufficient to take care of most types of patients.
INSTRUMENT ORIENTATION
Grasp the “Axis Rotation Grip” and rotate the instrument body to allow the axial scale to
read exactly 90 degree and 180 degree at the axis marks. Release “Instrument position
looking knob” and swing the tube of the instrument to one side. Raise or lower the
instrument by means of “Elevation Knob” until the leveling sight pin on the side of the lamp
house and the white axis marker are aligned with the patient’s pupil or with his outlet
canthus.
For grater accuracy in axis specification, turn the instrument in the direction of the other
eye, and make the same adjustment. If, the patient's head is not held in the proper vertical
position, it will not be possible to line up both pupils and canthi at the same level. When the
correct position has been established, be sure the patient’s head remains in position while
the readings are being made. The corneal axis measurement is based on the 0-180 degree
imaginary line connecting the outer canthi or pupil centers of the two eyes.
Another method of adjustment is to elevate the instrument until the small, black, circular
shadow, caused by the aperture in the target, falls on the bridge of the nose at the level of
the inner canthi, and then swing the instrument to the right or left, depending upon which
eye is to be examined first. Cover the eye not under examination with the occluder.
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Patient Fixation