Electronic keratometer is a precise optical measure instrument, designed for detecting curvature radius and diopter of cornea.
This keratometer consists of four parallel luminants, telecentric optical system, CCD transducer and corresponding circuits. The four parallel luminants are strictly symmetrical to the center with a certain angle between each other. Four lights that emit from luminants create four image points after refracted by the cornea. Move this instrument to focus this four lights to one point. When this point is almost on the cornea, the distance between keratometer and eye is about 40mm, CCD transducer can capture this four image point and display them on the LCD. When all the four image points are in the center of the screen, instrument will calculate automatically the curvature radius and diopter and display the result on the screen.
The measurement includes measurement of curvature radius and diopter of cornea. It measures continuously for several times and calculates the average automatically. This instrument is not harmful to cornea with high precision and easy operation. Infrared printer makes the printing easier.
Button group:press both left and right eye button to switch between the results of curvature radius and diopter of cornea.
Is the display screen. The readings on the left are for the right eye, while the readings on the right are for the left eye. They are (from top to bottom):
Let the examinee look at the green point in the keratometer with a best posture to cooperate with the examiner.
Switch on and press the measure button to turn on the four illuminates ( press left eye button to measure left eye and press right eye button to measure right eye). Hold the bottom of the keratometer and place it at a distance 40mm from the cornea, keep the plane surface of the keratometer perpendicular with the eye axis. Move the keratometer slightly to let the four lights focus on the examinee’s under-eyelid, then move the focus to the cornea. ( if the examinee cannot open his eye large enough, then hand of examiner is needed to make it larger) . Then look at the screen, move the ketatometer to make the four image points be shown on the center of the screen( see Pic 2), then keratometer will capture data and calculate automatically the diopter. Press both left and right eye button at the same time, it will switch between curvature radius and diopter of cornea. Press print key to print the measuring result.
The keratometer will give a short "beep" after each measurement, and each eye can be measured 8 times continuously with this keratometer. A long “beep” will be given after completion of 8 measures and the average will be shown on the screen. If it is less than 8 times, average of these measurements will be also shown on the screen.
All the accessories should be well kept. If anything is missing, the instrument could not be warranted.
This instrument had been strictly inspected and tested before putting into sales. We will offer free service or change defective parts only in the warranty period. But it will not prolong the warranty period, and the replaced defective part should be sent back to Suowei company. We will not take the responsibility if it is broken because of the wrong operation of user.All the pictures in this guide is for reference only, please see practicality as standard.
|Device type||Type B, power inside|
|Measuring range||3mm～12mm curvature radius|
|Measuring repeatability of curvature||≤0.08mm|
|Precision of curvature radius of cornea||0.1mm (0.5D)|
|Resolution of curvature radius of cornea||0.02mm (0.1D)|
|Resolution of axial angle of cornea||1 deg|
|Single measurement time||0.03s|
|Weight||0.5Kg include batery|
|Measuring power||300mW (without back light)|
|Measuring power||500mW (with back light)|
|Power supply||three AA battery|