Question About "Add" Value 
Author Message
 Question About "Add" Value

Greetings,

I am primarily Presbyopic & my prescription I OD & OS +0.5; add 2.00. I
have progressive lenses & my question is about the reading strength of
the lenses. Is it 0.5 + 2.00=2.5 diopters or just 2.00 diopters at the
bottom of the lens.
Thanks.

Rich



Fri, 12 Dec 2008 04:11:10 GMT
 Question About "Add" Value

Quote:

> Greetings,

Is it 0.5 + 2.00=2.5 diopters

Otis>  That is correct.

(I am not an OD -- but I think they will agree.)

Quote:
> Rich



Fri, 12 Dec 2008 04:53:48 GMT
 Question About "Add" Value
Quote:


>> Greetings,

> Is it 0.5 + 2.00=2.5 diopters

> Otis>  That is correct.

> (I am not an OD -- but I think they will agree.)

>> Rich

Thank you for the reply. If I were to get bi-focal glasses for computer
use, the prescription would be something like OD, OS 1.5, add 1.00 &
that would yield a 2.5 diopter lower lens to read with?

Thanks,

Rich



Fri, 12 Dec 2008 05:08:13 GMT
 Question About "Add" Value

Quote:

>Greetings,

>I am primarily Presbyopic & my prescription I OD & OS +0.5; add 2.00. I
>have progressive lenses & my question is about the reading strength of
>the lenses. Is it 0.5 + 2.00=2.5 diopters or just 2.00 diopters at the
>bottom of the lens.

The "Add" is added to the distance prescription, so in your case the
maximum power in the reading zone should be +2.50D.


Fri, 12 Dec 2008 05:15:16 GMT
 Question About "Add" Value

Quote:
> Thank you for the reply. If I were to get bi-focal glasses for computer
> use, the prescription would be something like OD, OS 1.5, add 1.00 & that
> would yield a 2.5 diopter lower lens to read with?

> Thanks,

> Rich

That is correct.


Fri, 12 Dec 2008 07:36:03 GMT
 Question About "Add" Value

Dear Rich,

I will make this statement as an Engineer.

I do not know how old you are, but your refractive state is +0.5
diopters
as you state.  The "range" of accommodation (stop-to-stop) reduces
as we get older.  If you "range is 2.5 diopters (let us say), then
you can see clearly through a +0.5 diopter lens, down to
about a distance of about -2 diopters.  ( -2.0 diopters is
a distance of about 20 inches -- or normal reading distance.)

You might take you glasses off and check this.  If at 20 inches
the reading is blurry, then you will need some "plus" to read.

You can obtain a "simple" plus in the drug store off-the-shelf.

You might try a +1.25 diopter lens, and see if that meets
your "near" requirements.

And further, you might check your distance vision on my
site:

www.myopiafree.com

on Eye-Chart #2 and determine your visual acuity
with no plus.

These are easy checks, and do not require OD involvement.

Just "fun" things to do.

To further respond:

Quote:
> Thank you for the reply. If I were to get bi-focal glasses for computer
> use, the prescription would be something like OD, OS 1.5, add 1.00 &
> that would yield a 2.5 diopter lower lens to read with?

Otis> If you Snellen is good, then you need to obtain a "weak" plus,
so that reading or the "computer" are comfortable for you.

Otis> Only YOU can check this -- if you wish.

Best,

Otis

Quote:
> Thanks,

> Rich



Fri, 12 Dec 2008 09:00:35 GMT
 Question About "Add" Value

Quote:
> You might take you glasses off and check this.  If at 20 inches
> the reading is blurry, then you will need some "plus" to read.

Dear Rich,

Please disregard Otis's postings. He is not in the medical profession and
not in any position to give medical advice like above.

Thank you!

Allen



Fri, 12 Dec 2008 09:05:59 GMT
 Question About "Add" Value

Dear Rich,

Please disregard Allen's postings.

He thinks you are intellectually incompetent -- and
I would bet that you are not.

To much "paternalism" here.  AFTER you have
done these simple checkes YOURSELF -- you
can go back to your OD, and talk to him/her about
them.

Think for yourself.

Otis

++++++++

Quote:


> > You might take you glasses off and check this.  If at 20 inches
> > the reading is blurry, then you will need some "plus" to read.

> Dear Rich,

> Please disregard Otis's postings. He is not in the medical profession and
> not in any position to give medical advice like above.

> Thank you!

> Allen



Fri, 12 Dec 2008 09:10:52 GMT
 Question About "Add" Value

Quote:

> Dear Rich,

> I will make this statement as an Engineer.

This begs the question of what you make all your
other posts as...

-Quick



Fri, 12 Dec 2008 09:26:06 GMT
 Question About "Add" Value
Quote:

> Dear Rich,

> Please disregard Allen's postings.

> He thinks you are intellectually incompetent -- and
> I would bet that you are not.

> To much "paternalism" here.  AFTER you have
> done these simple checkes YOURSELF -- you
> can go back to your OD, and talk to him/her about
> them.

> Think for yourself.

> Otis

> ++++++++



>>> You might take you glasses off and check this.  If at 20 inches
>>> the reading is blurry, then you will need some "plus" to read.
>> Dear Rich,

>> Please disregard Otis's postings. He is not in the medical profession and
>> not in any position to give medical advice like above.

>> Thank you!

>> Allen

To all that responded to my original question, I thank you. To the
optometrists on the board, I did just visit one & had my eyes examined.
My question was just a technical question & replies from both
professionals & "buffs"(for want of a better term) were helpful. The
reason I asked was that I had been prescribed progressive lenses with
the aforementioned prescription after stating that I spend all day on a
computer at work, not to mention a couple of hours at home. I currently
had a prescription pair of glasses from another optometrists 4 years
old(unknown diopter powers & I had forgotten them at work before my
appointment with the new optometrists). I had told the former
optometrist(from another state) that I primarily need them for computer
use. He prescribed a bi-focal with an intermediate power on top for the
screen & lower for reading. To this day, the prescription is perfect for
my needs. The single power intermediate is not quite strong enough for
me to read paper documents, so I need the bi-focal. I can get by with a
single lower power reading glass(which I did when these frames broke)but
prefer a stronger bi-focal. The problem is that the new optometrist told
me progressives were just what I needed for computer use, to read with &
to correct the slight fuzziness I have at distance. No sooner did I sit
down in front of a computer when I realized that they were functionally
useless for me at work. I am a mail service pharmacists who sits at dual
17" LCD monitors with an image of a prescription on the left screen &
various data on the right(patient profile, what the tech entered for the
prescription, etc.). This requires constant checking back & forth with
some speed for efficiency) to make sure the data-entry matches the
prescription. With the older bi-focals all I needed to do was move my
eyes back & forth. The progressives had such a narrow intermediate field
that it not only took constant head movements to acquire sharpness but
it also slowed me down to the point of uselessness. I usually ended up
just tilting my head all the way back to read the screen through the
near area & not the intermediate. However, after research, I discovered
that only near vision progressives are appropriate for use on a computer
& I liked the progressive for walking around, so I went back & changed
them to transitions(I live in Arizona, very sunny)& decided to order a
new 2nd pair of inexpensive computer-use bi-focal on-line to replace my
old one(frames 10 years old, lenses 4 years old, scratched with a slight
crack from trying to pop them back into a slightly bent frame). Hence,
my questions about how to order the "add" value. I'm just surprised that
the computer screen appears clear at 26" through the 2.5 diopter lowest
part of the progressives. I suppose I should take them to another shop
to confirm the correctness of the new prescription & obtain the powers
of my old bi-focals.
I welcome any insights on my saga & any flames for posting a needlessly
unsolicited long post.

Thanks again,

Rich



Fri, 12 Dec 2008 09:56:10 GMT
 Question About "Add" Value

Quote:

> To all that responded to my original question, I thank you. To the
> optometrists on the board, I did just visit one & had my eyes examined. My
> question was just a technical question & replies from both professionals &
> "buffs"(for want of a better term) were helpful. The reason I asked was
> that I had been prescribed progressive lenses with the aforementioned
> prescription after stating that I spend all day on a computer at work, not
> to mention a couple of hours at home. I currently had a prescription pair
> of glasses from another optometrists 4 years old(unknown diopter powers &
> I had forgotten them at work before my appointment with the new
> optometrists). I had told the former optometrist(from another state) that
> I primarily need them for computer use. He prescribed a bi-focal with an
> intermediate power on top for the screen & lower for reading. To this day,
> the prescription is perfect for my needs. The single power intermediate is
> not quite strong enough for me to read paper documents, so I need the
> bi-focal. I can get by with a single lower power reading glass(which I did
> when these frames broke)but prefer a stronger bi-focal. The problem is
> that the new optometrist told me progressives were just what I needed for
> computer use, to read with & to correct the slight fuzziness I have at
> distance. No sooner did I sit down in front of a computer when I realized
> that they were functionally useless for me at work. I am a mail service
> pharmacists who sits at dual 17" LCD monitors with an image of a
> prescription on the left screen & various data on the right(patient
> profile, what the tech entered for the prescription, etc.). This requires
> constant checking back & forth with some speed for efficiency) to make
> sure the data-entry matches the prescription. With the older bi-focals all
> I needed to do was move my eyes back & forth. The progressives had such a
> narrow intermediate field that it not only took constant head movements to
> acquire sharpness but it also slowed me down to the point of uselessness.
> I usually ended up just tilting my head all the way back to read the
> screen through the near area & not the intermediate. However, after
> research, I discovered that only near vision progressives are appropriate
> for use on a computer & I liked the progressive for walking around, so I
> went back & changed them to transitions(I live in Arizona, very sunny)&
> decided to order a new 2nd pair of inexpensive computer-use bi-focal
> on-line to replace my old one(frames 10 years old, lenses 4 years old,
> scratched with a slight crack from trying to pop them back into a slightly
> bent frame). Hence, my questions about how to order the "add" value. I'm
> just surprised that the computer screen appears clear at 26" through the
> 2.5 diopter lowest part of the progressives. I suppose I should take them
> to another shop to confirm the correctness of the new prescription &
> obtain the powers of my old bi-focals.
> I welcome any insights on my saga & any flames for posting a needlessly
> unsolicited long post.

> Thanks again,

> Rich

Ideally, you should measure the distance from your eyes to your monitor and
have an OD prescribe an appropriate pair of bi-focals or specially made
computer progressives for that purpose (that would place computer monitor
distance vision on the top and then you would add whatever power is
necessary to get to +2.50 for your reading area on the bottom).

Progressives are very difficult to fit properly, and a poor lens or frame
fitting could be causing the problems (or discrepancies) you are noticing
compared to what you expected. Or the lenses could have been made wrong. I
would take them to a different optical shop and have them measured (even
Wal-Mart optical will do this for you).

There are specially designed progressive lenses available for computer usage
such as Zeiss Gradal RD, but an experienced optician could design a pair
using regular progressives (with a high quality progressive lens design) to
function as computer lenses suing your custom Rx measured by your OD.
Progressives have some advantages, but your vision will never be as good
with progressives as it could be with bi-focals at those two exact
distances.



Fri, 12 Dec 2008 11:42:34 GMT
 Question About "Add" Value
So if some one was -5.00 and had and add of +1 the would really have be
reading through -4?

I have always wondered this.. Thanks.



Sat, 13 Dec 2008 21:05:10 GMT
 
 [ 12 post ] 

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