Contact Lenses

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Tristan - 17 Oct 2005 07:53 GMT

Hi,

I have been wearing glasses for about ten years now, and have been told in
the past that I would not be a suitable candidate for contact lenses. Prior
to getting my glasses I was having headaches which was caused by
hypertropia/hypotropia (misalignment vertically) in each eye and prisms were
prescribed.

I am short sighted (sphere left -3.00, sphere right -4.00) and have
astigmatism (cylinder left -1.00, right -0.75, axis left 175, right 180).
Prism in the right eye is 1.50 down, left eye 1.5 up.

I have been searching on the internet and have found that you can only have
base down contact lenses for prescribed prisms. I have two questions, Would
I be able to get away with correction in only one (right) eye (1.5 down),
and would it be possible to bring the right eye down 3.0 to level with the
left (which would mean both are at 1.5 down)?

Thanks,
Tristan.

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William Stacy - 17 Oct 2005 14:38 GMT

Yes you can, but if the weight and edge thickness pulls the lens down,
so that it rides lower than the other lens, the effective prism will be
less, so it will be a challenge to the fitter, to say the least.

w.stacy, o.d.

> Hi,
>
[quoted text clipped - 16 lines]
> Thanks,
> Tristan.

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Dr. Leukoma - 17 Oct 2005 15:42 GMT

The reason that the prism has been split between the two eyes is to
minimize the effect that the prism has on the thickness of the lenses.
Three prism diopters base down in the O.D. has the same effect as 1.5
down in the O.D. combined with 1.5 up in the O.S.

DrG

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Ian Hodgson opticians - 17 Oct 2005 16:24 GMT

Hi Tristan,

I have fitted contact lenses with your sort of prescription. It is not
always successful. If the base down prism is fitted on the deviating eye
then there seems to more chance of success.

I have found that the manufactures I use will only do the correction in
soft materials and low to mid-water content.Use of these materials as well
as being bespoke should mask the astigmatism.

Regards

Ian Hodgson - Isle of Man

> Hi,
>
[quoted text clipped - 16 lines]
> Thanks,
> Tristan.

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Jan - 17 Oct 2005 22:16 GMT

> Hi,
>
[quoted text clipped - 17 lines]
> and would it be possible to bring the right eye down 3.0 to level with the
> left (which would mean both are at 1.5 down)?

Tristan, contactlenses (RGP) are possible with an effective prismatic power
off about 2 prism.
Ask your eyecareproffessional if this is enough to avoid your headaches if a
RGP contactlens is placed on the right eye (the base of the prism
automaticly falling down).
In this way, you are 1 prism short in your correction
As you said, a prism of a power 3 is needed but such contactlenses are
impossible to wear so ask your practioner what he/she thinks.

TMHO soft contactlenses are not a possibility.

Signature

Jan (normally Dutch spoken)

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