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  1. #1
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    Stick on prisms?

    ok, I know this is strange but in all the years of being an optician I never
    came across having anything to do with stick on prism. Well, today I had my
    first experience. I ordered the prisms and I need someone to tell me what the
    heck to do with them or any information so I don't look like a fool when they
    come in and the patient brings in his frame what do I do with them how are
    they used. I am a very quick learn and if you briefly explain or send me to information I'll catch on thanks.

  2. #2
    Master OptiBoarder Darryl Meister's Avatar
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    Here's a good thread on the subject.
    Darryl J. Meister, ABOM

  3. #3
    Bad address email on file mhboptics's Avatar
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    This is very easy. Looking at the Fesnal Prism you should be able to tell the direction of the base, if not, the outer ring has a marking. Then I lay the prism face down, remove the lens it's to be applied to, put the lens on the prism with the correct direction and trace it using a pen. Cut it a little on the inside of the line, clean the lens and prism and apply with a rubbing motion.

  4. #4
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    Wave Fresnel Pasters

    Save yourself the time of marking it. Put it on the unmounted lens, trim with sissors. Then finish trimming (as much to the inside of the bevel as possible or it will move when you mount the lens) with a single edge razor blade (pkg. of 100 cheap at Harbor Freight or office supply).


    Chip

    You can check the direction of the base with your fingernail, it will catch on the base side and slide over the apex side. I cases of small lenses you can get two out of one fresnel for twice the profit if you are carefull. Remember there is no center to these.

    Chip

  5. #5
    OptiBoard Professional Ory's Avatar
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    Also remember that there should be absolutely nowhere that the fresnel sticks out over the edge of the actual lens. That is just asking for it to get caught and peel off.


    They will come off in certain circumstances, such as going from somewhere cold to somewhere warm, or if Chip Anderson applied them.:) Always let your patient know this and ask them to bring it back to you rather than try to stick it back on yourself.

  6. #6
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    The fresnel must be trimmed within the margin of the safety bevel. If it's not, it will peel. Rub the concave side of the spectacle lens and the smooth side of the fresnel with a conditioning solution such as Boston. Rinse with water and apply to each other while still wet. rub the fresnel from the center outward to eliminate bubbles.

    BTW, the s in fresnel is silent. So it is pronounced frenel. It's a French thing.

  7. #7
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    You mentioned prisms, plural. You do not normally split fresnel prisms. If the rx calls for 4bd right and 4bu left, you would normally do 8 down right or 8 up left.

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