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Why You Might Want to Specify Corridor Length?

Guest blogger, Juli DeWalt, ABOC, Regional Training Manager, has been with HOYA for 10 years and is based in Eugene, OR. You can email Juli at juli.dewalt@hoyavision.com.

If you’re like me, an optical geek, you are always looking to use technology to help your patients be as comfortable as possible. There’s an infinite amount of tweaking and adjusting that can be done to get a fit just right. We are proudly wired to “try just one more thing” if we think it will help!

You can let the lab pick the corridor length based on the frame choice and often this will work out just fine. However, specifying corridor lengths is another little thing we can play with that can have an impact on overall patient happiness. The three most common scenarios where you can make a difference are:

  1. Duplicate designs between two or more pairs of glasses, i.e. clear general purpose and sunglasses.

  2. Converting a bifocal wearer to a progressive.

  3. Power imbalance between right and left eyes where slab-off may be considered.

Let’s look at these situations one at a time.

Duplicate Pairs

You did it! You made a multiple pair sale (happy dance!) but now you are a bit concerned. Consider a patient who will be receiving progressives in an every day clear pair and the second pair is a sun wear. The sun wear is in a much bigger frame and there is a short corridor in the clear pair. The patient will struggle and feel like they need to search all the way to the bottom of the sun pair to find the reading zone when they switch from their clear pair. By specifying a shorter corridor length for the sun pair you will help the patient seamlessly find that reading zone when they switch from their clear pair.

Conversion to PAL from Bifocal

Patients in a regular bifocal know exactly where to look when they want the near distance. Often when they convert to a PAL they feel they have to look way down to the bottom of the lens to get the near distance power zone. By specifying a shorter corridor you can place the reading area higher up. The patient will get to their full add power quickly and comfortably in a manner similar to what they were used to with their bifocals.

Power Imbalance between Eyes

When there is a significant difference in power in the vertical meridian between the two eyes, a patient with binocularity may experience symptoms of vertical imbalance as a result of unequal prismatic effects. The further the eyes have to travel into the corridor, the greater the induced prismatic effect. Selecting the shortest possible corridor length will minimize the potential symptoms and possibly eliminate the need for slab-off correction.

HOYA BKS http://bit.ly/HOYAsalesaidBKS (back side PAL) Technology affords you the opportunity to use variable corridor lengths to improve the patient experience. The science, technology and innovation that HOYA provides to our independent practice allies will help you separate your brand and build loyalty in your community. Share your successes, I’d love to hear from you!

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