The Marco Nidek LM-990A lensmeter is ideal for measuring single vision lenses, bifocal (trifocal) lenses, Progressive Power Lenses (PPL), and Contact Lenses (CL). With the  measuring unit and a display unit in front, and a printer unit on the right side.

The measuring unit is comprised of a Nosepiece, a Lens Table, a Lens Holder, and a Lens Marker. Below the Nosepiece, there is also a Read Button for recording measured data and a Nose Slider on the Lens Table for measuring Pupil Distance (PD) of spectacles. The display unit utilizes a full-graphic LCD, displaying measured values of right-eye and left-eye lenses at one time,