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Home > Archive > Vision > November 2004 > Re: Aspheric glasses, blurry off center. Raise optical centers? (was: smaller glasses,
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Re: Aspheric glasses, blurry off center. Raise optical centers? (was: smaller glasses,
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| Robert Martellaro 2004-11-03, 7:12 pm |
| On 2 Nov 2004 21:41:58 GMT, Fred Ma <fma@doe.carleton.ca> wrote:
>Robert Martellaro wrote:
>
>
>Hi, Robert,
>
>Can you please point me to some basic information about fitting? I'm not
>sure what is involved in pre-adjusting the frame. I looked at
>http://www.harcourt-international.c...oks/pdf/246.pdf (last section
>titled "Astigmatism of Oblique Incidence", and my naive way of picturing a
>tilted lens evokes that image. I'm obviously not right about this because
>it supposedly increases the effective power of the lens. Is this
>preferable to raising to OC? Why would that be?
<snipped>
Fred,
Pre-adjusting simply means aligning the frame in front of the eyes in an
optimum manner and then measure for lens position. Although it's good practice
to do this on all fittings, this step can usually be skipped when fitting
spherical low power single vision lenses.
The next step is to start screening for an optician that has the knowledge and
skill to fit the type of lenses that you desire.
Hope this helps
Robert Martellaro
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Optician/Owner
Roberts Optical
robopt@execpc.com
~~~~~~~~~~~~~~~~~~
"Science is a way of trying not to fool yourself."
- Richard Feynman
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