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There are 3 ways to measure prism power and orientation on a manual lensometer. 1. If there are less than 5 prism diopters in the lens, simply count the number DESCRIPTION AND USAGE. The lensometer is used to measure the power of the spherical lens, power of the cylindrical lens, cylindrical. This User's Guide is designed as a training and reference manual for operation, maintenance and troubleshooting. We recommend that you read it carefully prior Pleasc refer to this manual before operating the unit. factory, laboratory, and professional office use. individuals use the saine Lensmeter. The focimeter, lensmeter, or Lensometer is the standard instrument used to measure the powers of spectacle lenses. Preliminaries for Use of a Lensometer. OBJECTIVE. ❖To measure the prescription of a patient's existing glasses, contact lenses, magnifiers, or other optical devices. ❖The lensometer MEASURESLM-8C : Align the scale with the stronger meridian by rotating the protractor ring. MEASUREMENT OF CONTACT LENS. Remove the lens stop and tilt the lensmeter