Glass glasses and hot coatings

Discussion in 'Glasses' started by Repeating Rifle, Jul 18, 2005.

  1. I have been using antireflection coated plastic lenses now for about 18
    months. For a while, I was surprised by how well they were surviving
    cleaning. Now, scratches and fuzziness is beginning to show up.

    How easy is it to get real glass lens spectacles these days? It seems the
    plastic is still being marketed more strongly than glass. Is it difficult to
    to get hard coatings such as quarter-wave (or higher performance designs)
    magnesium fluoride deposited upon hot glass lenses? How do I go about doing
    so without getting supercilious lectures on why the customer is totally
    ignorant about such matters?

    If I want computer glasses, how do I go about getting my distance/reading
    prescription modified according my specifications, again without having a
    nanny OD or ophthalmologist telling me that they know better. In my case I
    would want about a 1.75D addition to my distance prescription with a 1.25D
    or 1.50D bifocal add.

    I know that one argument for plastic is that it will make for lighter
    spectacles. In my case, after double cataract surgery, the thickness of
    external corrective lenses can be greatly reduced from what used to be
    necessary.

    Bill
     
    Repeating Rifle, Jul 18, 2005
    #1
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  2. 18 mos isn't bad, and the coatings are getting better (and more
    expensive) all the time. There are lots of high quality coatings to
    choose from these days.
    Not yet on the black market. No problem, if you don't mind the extra
    weight or your nose and the additional safety risk (they will be
    hardened, if purchased in the USA, but can still break into sharp, eye
    cutting projectiles if hit hard enough.


    Is it difficult to
    Glass is the most scratch resistant lens material on the planet, and the
    AR coatings that go on them are equally tough. No problem.
    OK if you like your monitor "in your face". I prefer a +1.25 add for
    the upper part, so I can sit farther back from the monitor, a strong
    personal preference. Plus you get greater depth of focus. And why so
    strong in the lower? Unless you're less than 20/20 best corrected, you
    may regret the narrow depth of focus there too.
    True, especially for computer glasses (I assume you WILL NOT be using
    these to run a lathe or some such activity?)>

    w.stacy, o.d.
     
    William Stacy, Jul 18, 2005
    #2
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  3. William Stacy wrote:
    Funny enough, the people who discouraged me from getting glass lenses
    used this as their primary argument. Weight. For the first few days I
    *did* notice the difference, but honestly, after wearing the glasses
    for ~ 2 mo. or so, I've gotten accustomed to it (and this is with an Rx
    in the mid teens ... should be even easier to do with a lower Rx). But
    anyway ...
     
    silverblue001, Jul 18, 2005
    #3
  4. Repeating Rifle

    Quick Guest

    I wore glass (non-Rx) sunglasses for many years. I was on
    the road a lot. Polarized, darkest neutral grey with a double
    gradient mirror. Ray Ban used to make a decent one until
    the hardening law in ('64?). Somewhat more recently Nikon
    made very excellent sunglasses (both lens and frame) with
    glass lenses and all the coatings and stuff inside the sandwich.

    The weight became very noticeable with all day wear in
    hot humid environments (golf). Once my face got oily and
    sweaty I couldn't keep them from sliding off my nose.

    I recently switched to Rudy Project sunglasses because of
    that and becoming a bit more safety concious. They're supposed
    to have really good optical characteristics? The glass lenses
    were significantly better. I've stayed with the plastic for the other
    reasons.

    -Quick
     
    Quick, Jul 18, 2005
    #4
  5. Than you for a very informative reply

    On 7/17/05 9:45 PM, in article
    MtGCe.4376$_%, "William Stacy"

    With my monitor at a distance I liked, I measured distance to it at about 57
    or 58 cm. If my distance correction is optimum and accurate, then 1.75D is
    just about right to move the screen to infinity.

    Often, while I am at my computer, I want to read smaller print or read
    instructions in dimmer than usual light. Seldom am I actually typing copy
    from a manuscript or a book. I like the extra bit of magnification.

    With intraocular implants, I get no accommodation anyway.
    Moreover, for my computer, I will probably get frames with somewhat smaller
    area than I would for general purpose wear.

    I must admit that I have been tempted to get the combination lathe, mill,
    and drill press made in China as sold by Harbor Freight. So far, I have
    resisted that impulse. I would probably get polycarbonate (Lexan) safety
    goggles if I ever were to yield to that temptation.

    Bill
     
    Repeating Rifle, Jul 18, 2005
    #5
  6. Although I don't play golf, the whether in Toronto has definitely been
    hot and humid lately. I don't think I'll be going out for an extended
    period of time though. ;) But yeah, I could see how that would be a
    problem. Glass lenses fit my lifestyle quite well. I still think what
    everyone was telling me was an exaggerated version of the truth.
    Perhaps in certain circumstances they are noticeably heavy, but in most
    of the situations I encounter on a daily basis, they are perfectly
    fine.
     
    silverblue001, Jul 18, 2005
    #6
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