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  1. Pelli Robson chart contrast decreasing factor

    Hi to everyone.
    someone knows the best way to determine the contrast decreasing factor for each triplet letter grooup in Pelli Robson Chart??

    Many THanks in advance

    Mauro.
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    HI Jpways , thank you very much for you reply. ...

    HI Jpways ,
    thank you very much for you reply.

    Hi Sharon,
    many thanks for your help (it's pleasant to see Italian words on Optiboard :smile:).
    You're right .This was my mistake ( As explained...
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    FDA parameter

    Hello Opticians,
    It's an emotion for me to open a new thread after so much time.
    Just one question i'm involved to understand the corneal topograph utility to determine a possible Keratoconus.
    Is...
  4. Could be a choice ! Anyway , we must remember...

    Could be a choice !
    Anyway , we must remember that normally a good hardcoat thickness using commercial laquers must be around 2.5-3 microns, and i suspect that a hardcoat layer of 3 o 4 microns (.....
  5. Thank you Shanbaum , for the interesting...

    Thank you Shanbaum , for the interesting explanation.
    It seems ,a problem , without solution.

    thanks
  6. Fingerprint, special watermark .... or defect , on freeform PAL

    Hi to everyone.
    Sometime , looking freeform PAL ,coming from different customers ,(coated and uncoated), near at the lens geometric center ,shows some regular deformations shaped like concentric...
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    Metamerism in tinted lenses

    Hello Optiboarders,
    just one question for everyone who knows this problem.

    recently i was involved in some discussion with our customers concerning of tinted lenses.
    Normally , they send us...
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    residual reflection color of AR coatings

    Hi essegn.
    I dont' know what you mean as 'AR layers colors' ,but if you speak about the 'AR residual reflection color' then please look this image and take inspiration ;).
    ...
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    Hi John. I use Phantomresearch colors for 5...

    Hi John.
    I use Phantomresearch colors for 5 years and i am satisfied.We color (obviously with adjustment) cr39,1.56,1.60,1.67 .
    I agree with Mauro.Airoldi ,best results using deionized water....
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    thanks!

    ....Many thanks Mctire!

    THis links are greats!:cool:
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    Thank U for infos.:) Mauro

    Thank U for infos.:)

    Mauro
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    slit lamp examination simulator

    Hello ,
    I want to know if exist some software that emulate a slit lamp eye examination . (something like "eyesimulator software ").

    thanks in advance.

    Mauro
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    Correct nylor thickness

    Hello guys.
    I was recently involved in a discussion with some customers concerning the calculation of the lens thickness needed to edge for a nylor frame.
    my rule is :
    if we speak about cr39 and...
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    Help need for Axcell Briot

    Dear Guys ,
    recently my Briot Axcell, cannot read the edge shape with the camera.
    I tried the following ::hammer:

    *) tried to read several edge type and to paint very very well the border and...
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    problem solved!!!

    Hi Chip.
    My RX lab solved the problem on 1.74 lenses.
    It seems ,the problem was born due to a broken filter in the polishing liquid recirculation system of LOH TORO XL polishing machine.
    This is...
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    'Evah Heared' ? I don't think it's a...

    'Evah Heared' ?
    I don't think it's a crystalization because if i look it with my stereoscopic microscope i can appreciate a small depth cut on cc surface.
    ...
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    ...This is the strange thing! If i look the lens...

    ...This is the strange thing!
    If i look the lens surface uncoated (just polished) with a spot light i can see nothing but the normal signs of the polishing . This defects( small cuts ) start to...
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    Hy Chip, I mean : problems of lens polishing...

    Hy Chip,
    I mean :
    problems of lens polishing before hardcoating phase.
    My suspect is that something is wrong in the polishing equipment during the polishing phase ( in the RX lab).
    Probably...
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    ..... on 1.74 lens polishing

    Hello.
    It is a period of discussions with the lab-guys who build lenses for my coating lab :angry:.
    Rencently we found problem on 1.74 concave sux lenses after hardcoating.
    Looking defects with...
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    many thanks

    Thank you very much !!!



    Mauro Ventura
  21. Replies
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    specific color for epileptic patients

    Hello Guys.
    my customer asked to me to color a lens with a BLU named "Z1".He told me that is a specific blue for people who suffers of epilepsy.
    I don't know which kind of blue is this.
    someome...
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    Ar brochure maker

    Hello Optiboarders.
    Problems to find Images to rich your New Antireflection Brochure ?

    No Problem .
    In attachment here a program that give you the possibility to customize as you want new...
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    Hello Ioptic, i am interest to know if in your...

    Hello Ioptic,
    i am interest to know if in your CR-39 cast procedure , you follow also the preparation of the cr39 monomer with the catalyst .
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    Nickel presence on plastic frames?

    Recently , a custumer asked us to confirm the absence of Nickel in a plastic frame or in our lenses .
    Obviously the Nickel is not present in any kind of surface coating on lenses But i don't know if...
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    Nickel presence on plastic frames?

    Recently , a custumer asked us to confirm the absence of Nickel in a plastic frame or in our lenses .
    Obviously the Nickel is not present in any kind of surface coating on lenses But i don't know...
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