Contact Lenses (Soft Toric) -- RFC 
Author Message
 Contact Lenses (Soft Toric) -- RFC

OK, I've just gotten soft toric contact lenses (I'm a first time contact
wearer) and I'm wondering what experiences others in net-land have had with
these little beasties.

"Toric" lenses are desgined for people with astigmatism, where it is crucial
that the angle of rotation of the corrective lens with respect to the eye
remain constant.  (Astigmatism is the term used to describe an eye which is
not perfectly spherical.  To correct an astigmatism, the corrective lens
must be rotated to the "proper" angle with respect to the eyeball.)  With
glasses, this is never a problem since the glasses are supported directly by
your nose and ears, and each corrective lens cannot rotate with respect to
the eye it corrects.

With contact lenses, however, each individul lens CAN rotate with respect to
the eye it corrects.  A normal contact lens can rotate a fair amount,
effectively destroying the corrective effect for that eye.

"Toric" contact lenses employ various methods to ensure that the lens always
remains rotated to the proper angle with respect to the eye.  One brand I
tried used "thin zones" in an apparent attempt to force the contact to "map"
itself to the eyeball in the proper corrective position (that brand didn't
work for me).  The brand I am currently wearing apparently uses a "weighted"
design, whereby the intended bottom of the lens is somehow heavier or
thicker, and automatically rotates the lens into the proper position.

I particular, I am wondering:

    1.  What is the typical "comfort" break in period for new contact
        wearers.  How long can I expect it to take before I don't really
        notice that I have the contacts in -- how long before they are
        comfortable?  Or will I always notice them to some degree?

    2.  How effective have you found the "toric" contact lens method of
        correcting for astigmatism to be?  Do your lenses remain stable
        throughout the day, or do they occasionally fluctuate and force a
        "blinking bout" to stabilize them?  Have you had experience with
        more than one type of toric lens ("thin zone" vs.  "weighted" toric

    3.  With "weighted" toric lenses, I've noticed that the orientation of
        my head can apparently affect the rotation of the lenses, thus
        imparing my vision.  (For example, if I lay down to take a nap, my
        vision is very blurred when I first sit up.  After 10 or 20 seconds
        of blinking my eyes, I can re-stabilize the lenses.  Should this be

    4.  What of gas-permeable (hard) lenses?  I've been told they actually
        re-shape your eye over the break in period so that they effectively
        REMOVE the astigmatism.  If you stop wearing gas-permeable contacts,
        your astigmatism will return over days or weeks.

    5.  How much effect does living in a relatively arid environment
        (Colorado front range) have on wearing contacts?

    6.  After converting from glasses to contacts, how sensitive are your
        eyes to wind and small breezes that would have previously been
        blocked by the ever present glasses?

    7.  Can I be an astronaut, or am I restricted to glasses as my only
        method of vision correction in a zero G environment?

Thanks for your comments,
Brent Geske

Sun, 05 Dec 1993 00:34:02 GMT
 Contact Lenses (Soft Toric) -- RFC
I should add that I am near-sighted, with a correction diopter of around
2.5 in each eye.  My astigmatism in each eye is fairly large, with the
diopter also at 2.5 for the astigmatism correction.

Brent Geske

Sun, 05 Dec 1993 00:34:10 GMT
 Contact Lenses (Soft Toric) -- RFC
I've worn toric lenses of the weighted type (Hydrocurve II) for over three yearshere in Boulder.  I find them very comfortable; I've never had trouble with overly dry eyes.  They only thing I don't like about them is that they *do* reorient themselves when you tilt your head, e.g. when reading or watching TV while lying on your side.

Jennifer Davila-Aponte

Tue, 07 Dec 1993 03:04:14 GMT
 [ 3 post ] 

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