OBTAIN ACCURATE MEASUREMENTS
Five tips for using an automated lensmeter
By Sue Corwin, CO, COMT, Jacksonville, FL
Lensmeters, which are used to determine the prescription of a spectacle lens or contact lens, record a number of measurements, such as the optical center of the lens, its power, the axis of the correcting cylinder and the cylinder power. While new lensmeters are automated, they still require some attention for accurate measurements. Consider these five tips to obtain the best results:
- Keep both sides of the glasses frame against the lens table to have the correct cylinder axis.
- Use the lens clamp to avoid pantoscopic tilt, which can cause a change in sphere and cylinder power. The lens clamp is used on the manual lensmeter and should be used on the automated one, too.
- Do not move the lens table once you find the optical center of the first lens. This helps in detecting small amounts of vertical prism when you go over to the second lens.
- If you are unsure whether the lens is a single vision lens or a progressive, “scan” the lens on the lensmeter, from the top of the lens to the bottom, observing the sphere power. If the sphere power changes more than 0.75 in the PLUS direction, they probably are progressives. Your automated lensmeter should have a special screen that assists you in measuring progressives.
- When using the special screen for measuring progressives, if you cannot obtain the “indicator” for the near ADD on a progressive, go to the bottom of the lens, slightly nasal, and measure there. When the glasses were made, the optical might have cut off the maximum ADD in order to fit the lens into a small frame.
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