On Apr 14, 11:16*pm, "Mike Tyner" <mty...@mindspring.com> wrote:
> "Zarlot531" <xy...@hotmail.com> wrote
>
> >I am a 27-year-old male. *A month ago, I was wearing Focus Dailies,
> > left eye -7.00 and right eye -6.00.
>
> I'm an OD with 27 years of fitting Ciba contacts.
>
> > These felt okay on my eye, but I went to Lenscrafters recently because
> > my vision started getting kind of blurry, as usual after I've had a
> > prescription for over a year or so.
>
> It reaches a point, often around age 27, when it surprises us and
> _reverses._ It's best to test the lenses on your eye, not to assume that
> more is always going to be better.
>
> > I decided to go with Optix 2 this time, mostly because she said the
> > Dailies only went up by - .5 once you got past -7.00. *The doctor
> > gauged my prescription at -6.25 right eye, and -7.5 left eye. *Here's
> > the deal: *and this may show my ignorance, but my Diameter for the
> > Dailies is listed as 13.8. *For the Optix, it's 14.2.
>
> Forget diameter. It has little or no effect on the vision. It affects
> comfort and fit, perhaps, but you'd hardly expect blurry vision from a
> larger diameter, especially if the blur increases in daylight.
>
> > Even though the prescription is stronger, things are still blurry.
>
> The blur may also occur because of an increase in astigmatism, or some other
> corneal irregularity that isn't compensated by simply increasing spherical
> power. Many people at your age wind up needing LESS, not MORE.
>
> > Honestly, I don't notice much of a difference between these and the
> > prior pair. *I guess I didn't notice it at first during the week
> > trial, but I notice now and will probably go back to Dailies. *It
> > doesn't feel like the contacts fit on my eye as well as the Dailies.
> > Do diameters generally vary between brands?
>
> Diameters are generally chosen by the manufacturer to fit an optimum number
> of different corneas. Most lenses these days are available in only one
> diameter. Some are only available in a single diameter and a single base
> curve. Until recently, all Acuvue Oasys were the same shape and size.
>
> > Also, I don't know if this was just last night, as I haven't been out
> > many nights, but my vision is actually CLEARER at night... especially
> > letters on signs and stuff. *During the day, letters on signs are
> > blurry.
>
> That's a curious observation but it only points out the need for a different
> approach to solving your problem.
>
> For the sharpest vision, you need to ask your doctor for a sphere and
> cylinder over-refraction, measuring the total prescription lacking with each
> version of contact lens. Thickness and stiffness vary the response of one
> contact from another, for these subtle aspects. The O2O is stiffer, IIRC,
> but it may also be thinner than the FD.
>
> Point is, only an overrefraction will explain which lens does a better job
> at approximating your total prescription. *In your range, there is a large
> and often individualized difference between eyeglass and contact lens
> prescriptions, and one should be used only as a general predictor of the
> other.
>
> -MT, OD
Thank you for your response, MT. Today, the blurriness was bothering
me. So, at lunch today, I noticed that I had a pair of my Focus
Dalies remaining, which again are -7.00 left eye and -6.00 right
eye.
I should have done this during my trial, but here are my observations:
1) Things are about "equally" as blurry in these Focus Dailies as
things are in my -7.50left, and -6.25 right. The difference, though,
is that the blurriness is uniform in nature. The blurriness in my
Optix seems to be as if the letters I see on signs, etc., are not only
blurry but also offset from each other. It's almost as if in the
Optix, I'm slightly seeing double vision, along with bluriness, but
just barely double vision. It's as if the letters are only slightly
offset from each other. To me, wearing my Focus Dailies today was
very much more comfortable because of this. Blurry...but uniformly
blurry.
It's been about 3 weeks or so since I got these contacts. I think I
want to go back to Focus Dailies though. I'm honestly not trying to
shill for Focus Dailies or anything, as I know probably Accuvue is a
better brand than Focus Dailies, but I think they feel good so maybe I
should just go back to them.
Thanks for your help.
Linear Mode
