Last Updated
  20th Oct 2006 

DTL Plus

[Specification], [Common Questions and Answers], [How to insert the DTL]


DTL PLUS Electrodes

DTL ElectrodeThe DTL Plus is an ultra low impedance, medical grade silver / nylon electrode developed for use in ERG testing. The DTL Plus incorporates several changes to previous fiber electrodes in physical construction and low impedance technology. The result of these improvements is a ready to use, disposable, corneal eye electrode that significantly enhances patient comfort. Additional benefits include a reduction in intra and inter laboratory coefficient of variation in ERG results. Created from the best medical grade materials, the DTL represents the most convenient and comfortable methodology for ERG testing.


NOTE: This a non sterile product. (sterilization not required for use)

Ordering Information

Part No



Single use DTL plus electrode


1m extender cable (normally sold as pairs)


male to female plug convertor


Female to male plug convertor


Single headbox jumper


Medical Grade Silver / Nylon Specifically Designed for the ERG Professional

  • New fiber construction and design
  • Dimensions: thread length 2.5" (6.5cm), connector wire 5" (13cm)
  • Low impedance technology, high signal to noise ratio
  • Highest silver content/conductivity available
  • Disposable design eliminates risk of transferring infection
  • CE approved

Proven Patient Comfort

  • Recognized worldwide as the most comfortable electrode for the patient - no anesthetic required
  • Reduces patient anxiety and discomfort
  • Three-step operation allows testing to begin immediately
  • The electrode of choice for children and elderly patients
  • Facilitates rapid testing, through rapid three step installation

Consistent, Reliable, Performance

  • Provides accurate and precise ERG test results
  • Standardized design and ultra low impedance fiber minimizes variation
  • The ISCEV standard for the growing pattern ERG market
  • There are many papers and references about the DTLís performance and excellence including comparisons between electrode types to be found on the web

DTL Electrode in use
DTL Electrode in use

Common Questions about the DTL



Are the DTLs sterile?

No, and do not require sterilization before use. You may however sterilize them if desired. Gas is best

Is the electrode a single fiber?

No. The electrode is composed of some seven interwoven fibers

Do you recommend any form of conductive lubricant on the eye?

No lubricant is necessary, though some users prefer to wet the electrode with isotonic saline to keep the fibers together when inserting

Should anesthetic be applied before the DTL is inserted into the eye?

Anesthetic is unnecessary. The DTL causes a slight foreign-body sensation when first applied, however, the sensation fades in minutes, and the DTL is unnoticeable afterwards

How long can the DTL be left in the eye?

When properly installed, the DTL causes no noticeable irritation and therefore can be left in the eye indefinitely, with no side effects.

How many uses is one DTL good for?

We recommend that the DTLs be disposed of after each use

How do I buy it?

Contact any Diagnosys Office. Quantity discounts are available

How to insert the electrode

The electrode can be easily inserted into the patientís eye if you follow these instructions:

  • Open the package
  • (If required place a few drops of saline solution onto the fibers to stick them together)
  • Remove the two sticky patches and affix the smaller end patch onto the nose with the fiber pointing towards the eye. You might have to rotate the sticky patch to achieve this
  • Ask the patient to look up and pull down a little the lower eye lid
  • Drape the fiber over the eye just above the lid, making sure as much of the fiber as possible is in contact with the eye
  • Release the lid. the fiber should now be either slightly behind the lid or just at the top of the lower lid in contact with the eye. You may need to perform this step again until the fiber sits correctly
  • Stick the larger sticky pad to the side of the face near the eye and drape the connection wire over the patientís ear
  • Check that the fiber is not too taught (you might ask the patient if appropriate if it is comfortable).
    If in doubt move the larger sticky pad slightly nearer to the eye to reduce tension
  • Finally connect the extension lead onto the electrode and plug into the montage

If all has gone well, your electrode should be in place similarly to that shown below:

DTL Eelctrode inserted into eye
DTL Electrode inserted into eye


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