|Marco’s LM-1800 features a compensation function for high-index lenses.|
Choosing a lens inspection system that suits your practice has become a lot easier thanks to the wide range of available models.
Checking and rating lenses is an important part of an eyecare professional’s (ECP) suite of services. We take a look at the top-performing lens inspection units.
A leader in the field since its introduction in 2012 is the HLM-7000 digital lensometer. It is manufactured by Huvitz, and distributed by Coburn Technologies Inc. and Veatch Ophthalmic Instruments. The unit can be configured to comprise part of Coburn’s modular Exxpert and Excelon systems and is a compact 190mm wide x 377mm deep x 237mm high. The unit features a newly designed interface and algorithm to provide quick and accurate measurements. Its ergonomically friendly adjustable tilting LCD monitor allows for users of all heights to comfortably view the screen: a graphical user interface, which utilizes icons rather than text, can enable a far swifter learning curve for novice operators as well as those who are upgrading to this system for the first time.
The HLM-7000 has the ability to automatically measure far and near sight addition with improved accuracy and speed (sampling speed is 0.016 seconds). It has an extensive diopter range (±25.00D), allowing for the measurement of a wide variety of lenses, and covers lens diameters from 15mm to 115mm. In the area of UV measurement, the HLM-7000 comes into its own: it can provide UV assessments with the precise numerical value of their lens protection, giving your patients a feeling of reassurance.
A handy one-touch command on the screen activates the device’s built-in printer, giving an easy-to-follow readout for patients. The HLM-7000 also includes an optional Measurement Jig accessory for measuring hard and soft contact lenses. The unit’s newly designed PD Bar and Measurement Nose can measure small, progressive, or multifocal glasses. A bonus feature is that the operator can still use the measurement nose when measuring the near sight addition.
The HLM-7000’s additional prism mode allows for a choice between five or 10 Prism Display and its Dark Sunglasses Mode allows ECPs to measure a wider range of sunglass lenses.
The AL range of lensometers (AL200, AL500, and AL700) from Reichert Technologies is a tried and trusted trio of machines that suits the needs of ECPs ranging from a small to a large practice. The compact desktop AL200 incorporates design elements similar to a manual lensometer for those ECPs who are budget-conscious. This unit is capable of handling single vision, multifocal, progressive, and prism, and has a contact lens conversion feature.
The AL500—and its upscale sister model AL700—features a full-color adjustable screen, as well as built-in printers. Both models can measure hard and soft contact lenses. The AL700, which weighs a manageable 6.8 kg, includes both serial and USB ports for importing and exporting measurement data (the AL200 and AL500 also have serial ports for transferring data). All three models have a -25.00D to +25.00D spherical power range and -10.00D to +10.00D cylinder power range, in increments of 0.01D, 0.12D, or 0.25D. Add and prism power ranges are from 0.00D to 10.00D, while the AL700 includes the additional features of PD measurement from 45mm to 85mm (in 0.5mm steps) as well as the ability to measure UV transmittance up to 100%, in 1% steps.
|Topcon’s CL-300 Computerized Lensometer includes a new UV measurement function for eyeglass and sunglass wearers.|
One company that has streamlined its lens inspection instruments is Topcon Medical Systems, Inc. It is now focused on the CL-300 Computerized Lensometer and the EZ-200 Advance Automatic Lens Analyzer. The EZ-200 is a sophisticated, yet easy-to-use, spectacle measuring system. It can automatically read lens power (sphere, cylinder, axis), recognize and measure multifocals and progressives, display far and near point distance from optical center for progressive lenses, and measure monocular and total spectacle PD.
The 12-kg. desktop-mounted unit is technically an eyeglass meter rather than a lensometer. Its Hartmann Shack sensor, which reads the entire lens area at once and allows for simultaneous measurement of right and left lenses, switches the display accordingly. The unit satisfies the sphere accuracy required for digitally indicating instruments in ISO 8598. Its full color 5.7-in. LCD screen provides easy readability for operators, even novices, with a single-button measurement process (and, in the case of the CL-300, a color-coded system for correct alignment and marking). Like other interactive systems, the EZ-200’s interface allows for easy communication with other Topcon products and a computer.
The CL-300 Computerized Lensometer adds some innovative elements to the range including a new UV measurement function which provides information on the ultra-violet transmittance in the range of 0%-100% for both eyeglass and sunglass wearers. The CL-300 also incorporates the ISO 7944-standard 546nm green light reading beam—or e-line—for extremely precise readings and includes a contact lens support and accessory package.
In addition, its new design also offers a simple physical design element: Topcon has added an additional 6mm of height in its lens support, allowing more space for high-curve lenses. The CL-300 features white marking ink to provide clear marking, even on lenses with anti-staining and anti-fog coating. Both the EZ-200 and the CL-300 feature built-in, easy-to-load printers.
|The AL500 from Reichert boasts a full-color adjustable screen, as well as a built-in printer.|
The TL-2000C and 3000C autolensometers from Tomey USA also cover the gamut of standard and high-index lenses, bifocals, trifocals, progressives, and prisms, as well as an option (in the 3000C only) to measure hard and soft lenses. Both machines have an SPH range of ±25.00D and CYL of ±10.00D as well as an add of -2.00D to 10.00D, all of which are measured in increments of 0.01D, 0.12D, and 0.25D, plus prism power of 0.00 to 10.00∆, in increments of 0.01, 0.12, and 0.25∆ (measurement time is a speedy 0.035 seconds). Both units are 205mm wide x 249mm deep x 445mm high and a portable 6 kg. In addition, the 3000C can measure the UV (385nm) transmittance, while simultaneously measuring the lens power. By using PD mode, the 300C can measure interpupillary distance with automatic right/left detection.
The LM-600 and LM-1800 Automatic Lensometer Series from Marco both utilize the Hartmann Shack sensor with 108 multiple measurement points. The 1800 also features a compensation function for high-index lenses, where the Abbe number is changeable in the range of 20 to 60. The 1800 is able to accommodate a measurable lens diameter of 20mm to 120mm for spectacle lenses and can also accommodate contact lenses larger than the inner diameter of the nosepiece.
Its measurement range is ±25.00D (Sph) and ±10.00D (Cyl) as well as an add of 0.00D to 10.00D in increments of 0.01D, 0.06D, 0.12D, and 0.25D, plus prism power of 0.00 to 20.00∆ in increments of 0.01, 0.06, 0.12, and 0.25∆, with a measurement time of 0.06 seconds. The unit measures UV transmittance up to 100% in 1% or 5% increments and incorporates a compensation function for high-index lenses where the Abbe number is changeable in the range of 20 to 60.
The ability to measure high-curve lenses, contact lenses, and above all, ease and speed of use are all features of the top-performing models on the market today. Patients can look forward to speedy turnarounds and a comprehensive report on their lenses, while ECPs won’t need to devote an undue amount of time to the task.
Paul Power is a freelance writer and editor based in New York City.
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