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Thread: Drill holes position!?!?

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    Master OptiBoarder LENNY's Avatar
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    Drill holes position!?!?

    Can someone explain to me the logic behind vertical position of drill holes?
    Bridge versus temples.
    Why sometimes they are on the same level, and sometimes temples are a bit lower or much lower!?!
    Whats the rule?

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    Master OptiBoarder OptiBoard Silver Supporter
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    I change the vertical drill hole positions often. In the end you want something which looks good and fits well. The other day I had a guy come in with a very large nose. I had to place the bridge 3 mm higher and put the loses a little closer to the inner edge of the lensessthan with the original set-up so that the the guy wasn't looking straight ahead through the lower third of the lens. I left the outer holes at their original vertical position, so I would not have to increase the tilt and unnecessarily stress the hardware. It came out looking very good.

    Again, the rule is you want to end up with something which looks good and fits well.

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    Master OptiBoarder OptiBoard Silver Supporter Barry Santini's Avatar
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    Silhouette's temples are generally 2mm lower than the bridge drill height

    B

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    Master OptiBoarder LENNY's Avatar
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    Quote Originally Posted by Barry Santini View Post
    Silhouette's temples are generally 2mm lower than the bridge drill height

    B
    I could not notice any logic in silhouette's position!

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    Kind of depends where you want the top and bottom of lens to ride (nasal drill holes) and one could allow for high or low ears or induce pantoscopic angle with temporal hole locations. There isn't any rule book. You gits to do what ever you think is best.

    Chip

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    Master OptiBoarder rbaker's Avatar
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    The location of drill holes are specified at the whimsey of an industrial designer. Their location is chosen with the single criteria "looks good to me" or "cant see it from my house." Sorry, there are no scientific rules involved.

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    Doh! braheem24's Avatar
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    Silhouettes are made for human faces whereas other manufacturers seem to cater to anomalies, I think they may have some thought behind the process.

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    From the position of the hole, you should obtain a 5° pantoscopic angle for the face

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    Quote Originally Posted by chip anderson View Post
    Kind of depends where you want the top and bottom of lens to ride (nasal drill holes) and one could allow for high or low ears or induce pantoscopic angle with temporal hole locations. There isn't any rule book. You gits to do what ever you think is best.

    Chip
    Such is the beauty of optimal customization!

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    I forgot there is one rule: The hole location should be the same on each lens. I have received jobs where they were up to 1/4" off.

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    Quote Originally Posted by LENNY View Post
    Can someone explain to me the logic behind vertical position of drill holes?
    Bridge versus temples.
    Why sometimes they are on the same level, and sometimes temples are a bit lower or much lower!?!
    Whats the rule?
    Perhaps, an engineer had input into the specific locations?

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    Master OptiBoarder LENNY's Avatar
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    Quote Originally Posted by VTC View Post
    From the position of the hole, you should obtain a 5° pantoscopic angle for the face
    Are you suggesting to measure every patients ear height?

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    Doh! braheem24's Avatar
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    Angle of the drill hole would give you panto, not the placement.

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    Master OptiBoarder rbaker's Avatar
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    Quote Originally Posted by LENNY View Post
    Can someone explain to me the logic behind vertical position of drill holes?
    Bridge versus temples.
    Why sometimes they are on the same level, and sometimes temples are a bit lower or much lower!?!
    Whats the rule?
    I believe AO (American Optical) held patents on the Full Vue frames back in the day. The idea was to place the endpiece above the 180 cutting line.

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    Quote Originally Posted by LENNY View Post
    Are you suggesting to measure every patients ear height?
    yes !
    You do that with normal frame, when you choose a frame with low or high temple on the face !

    It's important to take care at the pantoscopic angle, when you sell aspheric lenses or progressive lenses...

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    Blue Jumper

    Quote Originally Posted by rbaker View Post

    I believe AO (American Optical) held patents on the Full Vue frames back in the day. The idea was to place the endpiece above the 180 cutting line.




    This rimless frame is a "centerline" design. The temple arms join the frame half-way
    between top and bottom of the lens. See how all four screw mounting points are in line?




    Enter Ful-Vue Frames






    An incredibly hokey magazine spoof of Ful-Vue frames from mid-century.

    In the late 1920's, the American Optical Company(AO), the largest manufacturer of eyewear and prescription lenses in the world, filed very, very strong patents on their new "Ful-Vue" design. The Ful-Vue idea was to raise the point where the arms joined the frame, taking them up and out of the way of the wearer's side vision. Remember, this is at the same time many Americans were driving cars for the first time, so they were also using rear view mirrors for the first time. The frames were introduced in 1930.
    American Optical was convinced that Americans would be safer wearing Ful-Vue frames, as there would be no temple blocking the wearer's view of the rear view mirror. They also thought that America could be convinced they would be more attractive wearing Ful-Vue styles, with no "line drawn across the face" by the arms.



    Ful-Vue Numont



    An incredibly hokey magazine spoof of Ful-Vue frames from mid-century.



    and lots more at:

    http://clearlightoptical.com/Ful-Vue/


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