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Relationship -- Snellen to Diopters

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Relationship -- Snellen to Diopters
#1
When Bates did his successful 1917 study -- he listed all the results
in Snellen visual-acuity.

If you wish to "Improve your vnsion", you should think in terms of clearing your
Snellen.

Here are the reasons why -- and the relationship.


======

Dear Otis,

what is the difference in dioptres for each line of the snellen?

Say if one improved their reading of the snellen from 20/30 to 20/20,
what would be the dioptre improvement? I'm guessing between 0.25 and
0.50D.

Otis> If you has a set of minus lenses -- and YOU made the
measurement -- then that is what you would find out.

Otis> Clarifying commentary:

=========

Subject: An approximate relationship -- Snellen to Diopters.

There is no exact relationship. But the far-better measurement is
the Snellen.

The reason is that some ODs are over-prescribers, and others,
under-prescribers.

Some second-opinion ODs KNOW the minus is bad, and if the child is
20/40 -- will not "prescribed". The NEXT ODs -- who has no concern -
will prescribe a -1.5 diopter lens -- because he loves to impress
the parent with how "sharp" he can make Johnnie's distant vision.

This is not an exact science -- by a long shot. And that is the
reason.

BUT, if you read your Snellen, and KNOW what you are doing, then
you would find the following:

1. 20/20 -- Zero diopters.

2. 20/30 to 20/40 -- about 1/4 diotper

3. 20/50 -- about 1/2 to 3/4 diopter

4. 20/60 -- about 3/4 to 1 diopter

5. 20/70 -- about -1 to -1.25 diotpers.

Above 20/70, about 1 diopter for doubling of the Snellen,
i.e. 20/140 will be about -2 diopters.

But remember, it depends on the "whim", or "judgment"
of the OD doing the prescribing.

That is why I suggest you find a second-opinion OD,
and most important -- check your Snellen yourself.

Otis
Reply
#2
These are SUGGESTED relationships -- between Snellen
and "Diopters". :o

A good starting point is to read your prescription, and
then check your Snellen. Smile

My personal opinion is that you will have more confidence
in the Bates method of improvement if you verify your
clearing on your Snellen. It is alot less expensive, since
you do not have to go to an OD (who is too busy for you)
to confirm the restoration of your vision. Smile

Otis
Reply
#3
There are people who NEVER look at a Snellen. If you are serious about clearing
your vision (the way they did it in the 1913 study) then KNOW YOUR SNELLEN.

How else can you confirm your success? Smile
Reply

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