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Thread: Topcon LM T5 Lensmeter

  1. #1
    OptiBoard Apprentice Bradmain's Avatar
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    Confused Topcon LM T5 Lensmeter

    Does anyone have any experience with this lensmeter. I just purchased a used one and it has no service manual. It is in great condition but I have never seen a lensometer like this before; there is a secondary axis wheel surrounding the eye piece and for the life of me I cannot figure out why or what it is....? I have searched for a manual on this model and have had no luck.

    Any assistance is greatly appreciated.
    Brad Main, FNAO
    Director-Technical Marketing
    BluTech Lenses

    brad.main@blutechlenses.com

  2. #2
    Master OptiBoarder optical24/7's Avatar
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    I haven't used that lensometer, but if it's like a B&L it would be for checking prism. If you have compound prism (or just vertical or horizontal) you dial in the meridian (axis) at the eye piece to see if the prismatic amount is correct and in the right location.

  3. #3
    OptiBoard Professional Dustin.B's Avatar
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    If its anything like the TM 8E I have its a secondary axis guage. Mine has a crosshair inside the forward eyepiece that you can rotate to get a more accurate read on the axis. Or at least I think that was the idea. lol...
    ~Dustin B. AboC

    "Laugh, or you will go crazy."

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    I don't know for sure. But if I were guessing. I would think its a compensating lens, for the user. Most lensometers have spherical compensation. I would look and see if you can dial your prescription in there. This will allow u to get a accurate reading without glasses on. I wouldn't think it would be a prism compensator because those don't usually read like a axis wheel. Prism compensators are listed like a timeline or it only has 0-90. But if there is a little knob and u can move left and right and it twist and your cross hairs move then yes it is a prism com. Good luck

  5. #5
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    After looking on the Internet I found a Google search that might help u. And seems there are other conversations about it on opti board. Search: Topcon cross cylinder lensometers. There is a lot to read about hard contacts and it is like Dustin B. Posted it is like his lensometer. Sounded like it was more for hard contacts but can be used for glasses. However all the talk was about using the second wheel for RGP.

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