How to measure a refractive state using a retinoscope.
http://www.youtube.com/watch?v=qOxGuDl-gKI
Enjoy,
On Nov 25, 4:16*am, Lelouch Lamperouge <misa...@googlemail.com> wrote:
> [...]
>
> * * * * ——
> * * * * Children May Improve Their Sight by
> * * * * Consciously Doing the Wrong Thing
> * * * * ——
> * * Children often make a great effort to see the blackboard and other
> distant objects in school. It helps them to overcome this habit to
> have them demonstrate just what the strain to see does.
> * * Tell them to fix their attention on the smallest letter they can
> see from their seats, to stare at it, to concentrate on it, to partly
> close their eyelids—in short, to make as great an effort as possible
> to see it.
> * * The letter will blur, or disappear altogether, and the whole card
> may become blurred, while discomfort, or pain in the eyes or head,
> will be produced.
> * * Now direct them to rest their eyes by palming. The pain or
> discomfort will cease, the letter will come out again, and other
> letters that they could not see before may come out also.
> * * After a demonstration like this children are less likely to make
> an effort to see the blackboard, or anything else; but some children
> have to repeat the experiment many times before the subconscious
> inclination to strain is corrected.
> ——
> School Number
> Better Eyesight
> A monthly magazine devoted to the prevention and cure of imperfect
> sight without glasses
> Vol. V - August, 1921 - No. 2
> Copyright, 1921, by the Central Fixation Publishing Company
> Editor—W. H. Bates, M.D.
> Publisher—Central Fixation Publishing Co.
> Doctors are needed all over the world to cure people without glasses
> $2.00 per year, 20 cents per copy
> 300 Madison Avenue, New York, N. Y.
> ——
>
> [...]