Optical practices, dispensing counters, eye clinics, and optometry and ophthalmology departments use the TL-3000A to verify spectacle and contact lens power. Optometrists, dispensing opticians, and trained technicians load a lens on the table, align it, and read sphere, cylinder, axis, addition, and prism on one screen. Each reading takes 0.035 seconds, so a busy counter can check a patient's current glasses before an examination begins.
For dispensing, the marking device dots the axis at the centre of each lens, preparing it for edging. Prism can be shown in rectangular or polar form, and displacement from the optical centre helps the operator centre a lens correctly. The system measures pupillary distance from 50 to 86 mm in the same session, and the built-in thermal printer records the result in the patient file.
For difficult lenses, the high-power mode covers strong prescriptions, and the high-index mode suits thin lenses of 1.6 and above, with an Abbe number adjustable in 5-step increments. The system automatically detects progressive lenses and measures single vision, bifocal, and trifocal lenses. It can also check contact lenses, which suits a fitting room.
A UV check shows lens transmission at 370 nm as a bar graph, so staff can discuss protection with the patient on the spot and note the result beside the power. The RS-232C serial port passes data to a computer, and automatic shut-off saves energy between uses. The unit accepts lens diameters from 20 to 100 mm and measures 260 × 220 × 438 mm.