Definition : Ophthalmic measuring instruments designed to determine the distance between the pupils. The instruments usually consist of a light source to generate the reflection from the cornea, a target object for eye fixation, an alignment component for adjusting the reflection lines on the pupils, a sensor for detecting the light reflection, data processing software, and a screen for displaying the result. Ophthalmodiastimeters are used mainly to establish the distance required between lenses when making prescription eyeglasses.
Entry Terms : "Pupil Distance (PD) Meters" , "Ophthalmic Measuring Instruments" , "Measuring Instruments, Ophthalmic"
UMDC code : 12805