Symptoms of poor fit in soft contacts

Can anybody describe to me some symptoms of poor fit in soft contact
lenses? I am now on my third brand of soft lenses, and I am
experiencing the same symptom with all of them: my vision is great
when I am outdoors or driving, but if I am working on my computer, my
vision fluctuates between relatively clear and slightly blurry (in the
time It's taken me to type this entire message, I've seen both
extremes). I can see fine text on my computer monitor, but it is not
as clear as when I am wearing my glasses (or when I was trying out a
pair of RGPs). It makes no difference if I use rewetting drops or if
I make a conscious effort to blink a lot when I am at my computer, so
I suspect that dryness isn't the problem, although I do often have a
sensation of dryness when I am in air-conditioned stores.

My doctor says that I have very flat corneas and that I should be
wearing the flattest possible base curve lenses available, but I just
read the following article which made me wonder if this is necessarily
correct (which supports something that Dr. Larry Bickford was trying
to convince me of recently in another thread--that base curves
shouldn't be used too strictly):

http://www.clsa.info/ContinuingEducation/pdf/2Q2_01p7-11.pdf

Lothar

 

What is your age? You might be borderline presbyopic. Also, people tend
to blink far less when on the computer.

Some brands of soft lenses come in only one base curve...! For very flat
corneas, I will use a lens that is available in a flat base curve. A steep
soft lens on a flat cornea can actually "tent," or form a slight pucker in
the center which causes the vision to fluctuate with the blink. However,
this should be more noticeable at far than near.

DrG

 

Thanks very much for your helpful response, DrG. I have a few
comments...

I am 36 years old. My ophthalmologist did a pretty thorough eye exam
(within the past few weeks) and didn't say anything to me about being
presbyopic. Although I am not a doctor and know very little about the
condition, I tend to discount it as a possibility because (1) I can
focus on near objects just fine when I am wearing my glasses (which
were prescribed for myopia--I have a -2.00D prescription), or when I
am wearing nothing at all (although I do have to get bit closer when I
am not wearing my glasses), (2) I didn't have trouble viewing my
computer monitor when I was trying out a pair of RGP lenses, and (3)
there are times with my soft lenses where I can see my computer screen
just fine--it simply is not consistent. Would it help me rule that
possibility out if I tried wearing drugstore-bought reading glasses
when I am at my computer?

Yes, I am aware of that, but even when I make a conscious effort to
blink more than I normally do even away from the computer, or use
rewetting drops when I am at my computer, it makes no difference.

That does sound a bit like what I am experiencing--at times when my
computer monitor is blurry, if I blink a few times it will sometimes
get better. At this moment, the text I am typing is crystal clear,
but a paragraph ago it was slightly blurry. But it is definitely near
vision that is fluctuating--my distant vision is very good (or at
least I don't notice it as much with distant objects because I am not
trying so hard to focus on them as I am with fine text on a computer
monitor).

Lothar