distometer

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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along Ganga River with total station equipment (computerized survey theodolite cum distometer of 5 second accuracy) including detailed drawing of Survey and shall include but may not be restricted to the following activities
3 are usually portable instruments that combine angular and distance measurements using a laser interferometer or an absolute distometer to determine 3D coordinates.
Tenders are invited for Supply of helicam and laser distometer