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    How to Pick Correct Lap Tool?

    Hi Everyone - I have perhaps a basic question....

    Can you explain how to pick the proper Lap tool for a given prescription?

    Is there a proper formula?

    For Instance an Rx:

    OD: -0.75 -1.00...
  2. Thank you Darryl! I am wondering though, what...

    Thank you Darryl! I am wondering though, what about the numerator? As it stands, the chart has acuities such as 10/200, 10/100, 10/80, etc.... So would I also adjust the numerator in these examples...
  3. Help, converting snellen acuities 10 feet chart viewed at 5 feet

    Hello. I bought a 10 foot snellen chart and it's fine but we have to hang it 5 feet from the chair we are using? Can you help us convert the visual acuity it says on the 10 foot chart we got to...
  4. Thank you all! These are great resources!

    Thank you all! These are great resources!
  5. Lensometer Assistance - Specifically, Reading PRISM

    Hello to all!

    I wondered if anyone would possibly have any articles with photos on how to read prism on the Lensometer? Or if at all possible to point me to such a document or video on this...
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