Optical practices, dispensing counters and lens workshops use the LM-25 to read the power of spectacle and contact lenses. Opticians, optometrists, and workshop technicians operate it at the bench, and the readings inform checks of finished lenses against a prescription. It handles both small and large lenses, from 24 mm to 90 mm in diameter, and each lens is placed on the instrument and read at the bench.
The tilting body suits a bench where several people share one instrument. It tilts from 30° to 90° and clamps at any angle so that each operator can set a comfortable posture for the session. A full 90° tilt brings contact lenses to a convenient reading position, and the unit includes a dedicated contact lens holder and a bifocal lens holder as standard accessories.
Measurement follows a clear routine. The operator sets the eyepiece within its +7 D to −10 D correction, brings the crossline and corona target into focus and reads vertex power from +25 D to −25 D. Cylinder axis is read from 0° to 180°, and prismatic power up to 5 Δ. An optional prism compensator extends the prism range to 15 Δ for lenses that need it.
The internal halogen bulb keeps working conditions steady, and two lamps are supplied so a spare is always on hand. A dust cover protects the instrument between sessions. Power is graduated in 0.125 D steps within ±3 D and in 0.25 D steps beyond, which lets a counter record values to the precision its prescriptions need.