Re: Why incompetent bifocal studies fail.

On Jul 27, 11:21 pm, "otisbr...@xxxxxx" <otisbr...@xxxxxx> wrote:
Subject: Why the bi-focal (plus) studies PRESUMABLY fail.

The bifocal (strong-minus on top -- VERY weak plus on bottom) has been
used for the last 50 years.

When the study is done CORRECTLY (i.e., the Oakley-Young)
study, the minus group goes DOWN at a rate of -1/2 diopter per
year. The plus group does not go down. The data was
collected over four years.

Further over 200 children were used in the study, which
is necessary for statistical accuracy.

Not so accurate. If you read the actual study, you find that Oakley-
Young decided to omit the results from some control group subjects and
then used other control subjects' results several times. Control
group and treatment group were not matched for age of first myopia or
for age/sex distribution.

Dr Judy

.