Using high precision linear sensor, advanced intelligent electronic system, digital display, the test results are more intuitive, clear and accurate.
Sophisticated optical equipment used to measure the distance between the human pupils during inspection to wear glasses.
Student distance:
Interpupillary distance and monocular distance
PD for Binoculars: Distance from the center of the pupil of the eye.
Monocular PD:Distance from the center of the left or right pupil to the middle of the nose.
Monocular and diagonal eyes, especially those who need progressive polyfocal lenses, should measure the pupillary distance of one eye.
Long VS Close Distance
Long distance PD:Distance between the pupil center of the two eyes in infinity
Proximity PD (NCD): The distance between pupil centers when you see nearby targets, i.e. when reading or working at a close distance of 30-40cm.
Myopillal distance is always smaller than the distance between the pupil
List: 1 x PD meter