LY-9AT PUPIL DISTANCE METER
The pupillary distance meter is a measuring instrument used in optometry to measure the distance between the two pupils of the human eye.
The interpupillary distance can be divided into binocular interpupillary distance and monocular interpupillary distance. Interpupillary distance refers to the distance from the center of the pupil of the right eye to the center of the pupil of the left eye. Monocular interpupillary distance refers to the distance from the center of the pupil of either the right or left eye to the centerline of the bridge of the nose. Individuals with strabismus, especially those who require progressive multifocal lenses, need to measure their monocular interpupillary distance.
The measuring principle of the pupillary distance meter involves illuminating a visual mark with a light source. The mark is then imaged at a specific working distance in front of the patient's eyes using an optical system.
Consequently, the light forms a reflective point on the surface of the patient's left and right corneas. The optometrist can observe these two reflective points through the eyepiece and adjust the measuring button until the benchmark hairspring aligns with the reflective points of the patient's left and right eyes. The patient's interpupillary distance can then be obtained and displayed on the screen.
Note:
Please choose a well-lit environment.
Ensure the eyes of both individuals are at the same level during measurement for accuracy.
Do not move the device during measurement, as it may cause significant errors.
Ensure both eyes are facing the vertical line in the field of view simultaneously when measuring the interpupillary distance.
How is the Pupil Distance Meter used?
1. Boot
Insert two AA batteries and press the power button (Main key).
2. Basic settings
Adjust the working distance (VD) and select binocular or monocular measurement according to the measurement requirements.
3. Start measuring
Position the device between the examiner and the subject, with the device facing upward.
Ensure the device is level, and both individuals' eyes are at the same level. Place the metal frame on the subject's forehead so that the device is facing the nose.
The subject should look straight ahead, while the examiner observes through the front window. Adjust the left and right sliders until the vertical line aligns with the center of the pupil.
Do not move the device during the test. Repeat the alignment and calibration without moving the slider after alignment.
4. Reading
Remove the distance meter and read the data. Repeat the test procedure at least three times, combining monocular and binocular measurements as needed.
Hot Tags: pupil distance meter, China pupil distance meter manufacturers, suppliers, factory
Specifications:
|
Method of measurement: |
Cornea reflection light coincidence method |
|
Range of measurement: |
44~82mm(both eyes), 22~41mm(each type) |
|
Auto-off time: |
1 minute, or turn it off manually |
|
Graduations: |
≤0.5MM |
|
Range of focusing point: |
30 cm~∞ |
|
Power source: |
DC4.2V |
|
Weight |
0.8kg |
|
Volume |
31*23*11cm |
