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distometer

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distometer
An instrument for measuring the distance between the back surface of a spectacle lens and the apex of the cornea. It is usually carried out by having the patient close the eyes. One end of the instrument or caliper rests against the upper eyelid and the other presses against the back surface of the spectacle lens. The measurements are most commonly given to the nearest 0.5 mm. Syn. Lenscorometer (a tradename); vertexometer.


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In order to monitor natural and induced strains in the gypsum body, particularly in case of water table fluctuations, it is convenient to make periodically pinch measurements with bend or optical distometers and install pressure cells and transducers (electric or vibrating wire) at the mining wall.
 
 
 
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