WHAT YOU NEED TO KNOW ABOUT LENS INSPECTION SYSTEMS

0
Reichert’s AL700 makes it easy to store patient data.
In order to read lens data easily and reliably, use a lens inspection system which can provide effective positioning and computer accuracy.
Lens inspection systems represent the leading edge of lens power reading and eyewear verification. These instruments provide computer accuracy with ease-of-use that nearly anyone can be taught to use. Here are six questions I recently heard about lens inspection systems:

1. How accurate is the PD measurement of these instruments?
The manual method of measuring a pupillary distance (PD) with a PD stick and a manual lensometer is full of problems. One of them is that the lensometer operator has to interpret when the optical center of the lens is accurately positioned in the right location inside the instrument. Interpretations vary and can be wrong. Measuring optical center placements marked with lensometer ink is also open to reading and alignment errors.

With a lens inspection system, you won’t need to do any of this. A system like the Marco LM-600PD lensometer uses 108 data points to provide amazing positioning, power reading accuracy, and relia-bility due to its Hartmann-Shack wavefront sensor technology. PD measurements can easily be measured for both distance and near. The instrument automatically detects whether you are measuring a right or left lens. Just set the eyewear on the compact lens table and use the easy-to-follow full- color and graphic LCD screen. There is also a unique PD slider to hold the eyeglasses in place while measuring and the automatic lens detection will determine what type of lens you are measuring (like single vision or progressive) and automatically switch to that mode.

The EZ-200 Advance Automatic Lens Analyzer by Topcon can simultaneously measure the right and left lenses.
2. Can these units accurately measure PALs?
Progressive addition lenses (PALs) can be a snap to measure when using the appropriate measuring system. This is especially important when troubleshooting patients who are having a hard time adapting to their new lenses or you need to know what they are currently wearing to compare with a new prescription. The goal here is to make sure that the PALs’ Rx can be verified, re-marked, and placed on the patient properly.

For example, the EZ-200 Advance Automatic Lens Analyzer by Topcon Medical Systems Inc. automatically reads lens power (sphere, cylinder, axis), recognizes and measures multifocals and progressives, displays far and near point distances, and measures monocular and total PDs. The instrument also simultaneously measures the right and left lenses. The EZ-200 also features a large color LCD display, a built-in printer, and a single button measuring process. The auto dust- detection function automatically indicates if there is dust on the glass plate that may interfere with the final measurement. Just place the eyewear on the plate, push the appropriate buttons, and obtain the results. All measurements are instantly displayed.

3. How can I determine if there is UVR protection in a lens?
Verifying ultra-violet radiation (UVR) absorption in ophthalmic lenses and plano sunwear is very important so you’ll want to ensure that the lenses you dispense are UV absorbent to the proper level. There is an easy way to accomplish this with some of these instruments.
PD measurements can easily be measured for both distance and near by the Marco LM-600PD lensometer.
For example, the TL-3000C by CBD/Tomey offers precise measuring to ensure that the UVR transmission of a lens is accurate and it simultaneously does this while verifying the lens Rx or other measurements. Just select the UV button on the screen and the UVR transmittance for the right and left lenses will appear (up to 385 nanometers). The left side of the screen will display easy-to-understand images of the sun, the light spectrum, and the human eye. The right side of the screen will display the same information in percentages. After you have finished, just touch the back button and return to the previous screen.

4. Sometimes I can’t read the amount of prism in a lens with my manual lensometer. Any suggestions?
It can be very challenging to verify prism. There are times when the prism may be prescribed or there can be induced prism by error. These may include PD measurement errors, blocking errors, and edging mishaps like slippage. Regardless of the reason for prism, exactness is needed.

The Huvitz HLM-7000 by Veatch Ophthalmic Instruments is a great lens measurement system that can precisely measure prism. The HLM-7000 features display modes for both high and low prism detection, allowing for a more accurate reading. The instrument has two prism display levels, five or ten prism. For high prism amounts, simply choose the Ten Prism mode. This mode gives you the status of a wide area of high prism. The Five Prism mode gives lower prism readings.

The HLM-7000 offers precision with cutting-edge digital technol-ogy. Reading prism is easily done by using the user-friendly on-screen guidance. By following the prompts, the process is simplified and the results are immediate, eliminating any guesswork, so you can read prism in ophthalmic lenses with confidence. The compact design takes up little counter space and allows for small children’s lenses to be measured without interfering with the temples.
Model Manufacturer Measurements
TL-3000C CBD/Tomey Sphere ± 25.0D
Cylinder +10.0D
Axis 0˚ to 180˚
Add -2.0D to 10.0D
Prism 0 to 10▲
PD 50mm to 86mm
LM-600PD Marco Sphere –25.0D to +25.0D
Cylinder 0.0D to ±10.0D
Axis 0° to 180°
Add 0D to ±10.0D (Add 1 and Add 2)
Prism 0 to 20▲ (horizontal),
0 to 20▲ (vertical)
EZ-200 Topcon Sphere 0D to ±15.0D
Cylinder 0 to 180°
Prism 0 to 10.0D▲ at PD 64mm
PD 48mm to 80mm – NPD
24mm to 40mm
Huvitz
HLM-7000
Veatch Sphere 0D to ±25.0D
Cylinder 0D to ±10.0D
Axis 0˚ to 180°
Add 0D to 10.0D
Prism 0 to 10▲
AL700 Reichert Sphere -25.0D to +25.0D
Cylinder 0D to ±10.0D
Axis 0˚ to 180˚
Add 0D to ±10.0D
Prism 0 to 10▲
PD 45mm to 85mm
Excelon Coburn Technologies Sphere ±25.0D
Cylinder ±10.0D
Axis 0˚ to 180˚
Add 0D to 10.0D
Prism 0 to 10.0D▲

5. Our office is in the process of going paperless. How can we incorporate this and save the eyewear lens data at the same time?
It is great to hear that your practice is going “green.” Some of these instruments like the AL700 by Reichert Technologies make it easy to store patient data. The Auto Memory feature stores lens measurements with the push of a button. And if you need to keep a hardcopy, just press the PRINTER icon on the LCD screen to send the data to the AL700 printer.

6. Is it possible to identify lens materials with one of these units?
Most patients have difficulty wearing two different lens mat-erials and I happen to be one of them. Finally there is a device that determines the lens material for you. The Excelon Auto Digital Lensmeter by Coburn Technologies, Inc. indicates which lens material is being measured while also indicating the material’s Abbe value from 30 to 60 in one easy step.

Lens inspection systems make the task of reading lens data easier and more efficient. Once you use one, you’ll never want to use a manual one again.


Jackie O’Keefe is a licensed optician and writer, lecturer in the Virginia Beach, VA, area.


WHERE TO FIND IT:

CBD/TOMEY
888-449-4045 • cbdophthalmic.com

Coburn Technologies, Inc.
800-262-8761 • coburntechnologies.com

Marco
904-997-4149 • marco.com

Reichert Technologies
716-686-4500 • reichert.com

Topcon Medical Systems, Inc.
201-599-5148 • topcon.com

Veatch Ophthalmic Instruments
800-447-7511 • veatchinstruments.com
Share.

Leave A Reply