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Thread: RX Under Water

  1. #1
    OptiBoard Professional Mike Fretto's Avatar
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    RX Under Water

    Does an RX have to be adjusted other than vertex when mounted in a scuba mask? I would think as long as there is air between the lens and the cornea the existing rx should work fine regardless of what the light passes through prior to the lens.
    Mike

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    Master OptiBoarder lensgrinder's Avatar
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    If you are using a plano front curve there is no need to adjust the Rx. If you are using anything other than a plano front then yes you need to adjust.

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    Objection! OptiBoard Gold Supporter shanbaum's Avatar
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    It depends on the kind of mask. An insert that fits completely inside the mask - with air on both surfaces of the lens - needs no compensation. For masks that expose the front surface to the water, lensgrinder stated it correctly.

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    OptiBoard Professional Mike Fretto's Avatar
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    So a plano base lense laminated to the inside of the mask would need compensation?
    Mike

  5. #5
    Master OptiBoarder lensgrinder's Avatar
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    No, no compensation is needed in this case and you do not need to use a plano base in this case either.

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    Quote Originally Posted by lensgrinder View Post
    No, no compensation is needed in this case and you do not need to use a plano base in this case either.
    You most certainly do need to use a plano base. The flat surface of the mask lens and rx lenses need to be bonded flat against each other.

  7. #7
    Objection! OptiBoard Gold Supporter shanbaum's Avatar
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    Quote Originally Posted by CME4SPECS View Post
    You most certainly do need to use a plano base. The flat surface of the mask lens and rx lenses need to be bonded flat against each other.
    What if the mask isn't flat?

    (Answer: it will probably be really hard to cement lenses to it.)

  8. #8
    Master OptiBoarder OptiBoard Silver Supporter Barry Santini's Avatar
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    for this thread, try this link:

    www.hydrooptix.com

    Interesting....

  9. #9
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    Quote Originally Posted by shanbaum View Post
    What if the mask isn't flat?

    (Answer: it will probably be really hard to cement lenses to it.)
    I've never seen a non rx one that wasn't. If it wasn't, the curved front would cause refractive error in water. Right?

  10. #10
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    Quote Originally Posted by Barry Santini View Post
    www.hydrooptix.com

    Interesting....
    That is interesting!

  11. #11
    Master OptiBoarder lensgrinder's Avatar
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    Quote Originally Posted by CME4SPECS View Post
    I've never seen a non rx one that wasn't. If it wasn't, the curved front would cause refractive error in water. Right?
    You would compensate if the lens is in water, but if it is inside the mask no compesation is necessary because it is surrounded by air. If the front surface of the lens is in water then you need to compensate because it is no longer in air it is in water.

  12. #12
    OptiBoard Professional Mike Fretto's Avatar
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    Quote Originally Posted by lensgrinder View Post
    If the front surface of the lens is in water then you need to compensate because it is no longer in air it is in water.
    So if the front surface of the refracting lense is mounted to the inside of a diving mask and the outside of the diving mask is in water you are saying we need to compensate right? The masks Barry refered us to are pretty cool but for rx mounting they refer to flat lense masks.
    Mike

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    Quote Originally Posted by Mike Fretto View Post
    So if the front surface of the refracting lense is mounted to the inside of a diving mask and the outside of the diving mask is in water you are saying we need to compensate right? The masks Barry refered us to are pretty cool but for rx mounting they refer to flat lense masks.
    NO! You do NOT need to compensate. The front of the mask lens is flat. Just figure vertex, order a plano base and bond it. That's it.

  14. #14
    Master OptiBoarder lensgrinder's Avatar
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    Quote Originally Posted by Mike Fretto View Post
    So if the front surface of the refracting lense is mounted to the inside of a diving mask and the outside of the diving mask is in water you are saying we need to compensate right?
    No. The lens itself is not in water.

  15. #15
    ATO Member HarryChiling's Avatar
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    Quote Originally Posted by Mike Fretto
    So if the front surface of the refracting lense is mounted to the inside of a diving mask and the outside of the diving mask is in water you are saying we need to compensate right? The masks Barry refered us to are pretty cool but for rx mounting they refer to flat lense masks.
    Technically yes, but the problem with your scenario is that the front surface in most diving masks are flat or plano and are therefore not a refracting lense. The refraction occurs at the back surface, unless your mask has some curve to it then you would need to compensate as previously mentioned, because the surface would cause refraction.
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