SUBJECT: A proposed scientific study for myopia prevention.
Click here for a revised copy of the book on prevention.
otis_v4, How to Avoid Nearsightedness
“How to Avoid Nearsightedness”, describes why this preventive approach can be effective – with the people who have the motivation to make their professional goals and personal efforts successful – during four years in college.
ERRATUM PAGE FOR STATISTICS, Chapter VI
The “N” value for number of measurements is 22, not 23. The calculated value for the correlation coefficient is r = 0.99, not, r = 0.97. This is far more accurate that previously calculated. The “p” value is 1 E^-19, that far exceeds the required, “Highly Significant” value of 0.01.
These calculations are included on the “Sum of Squares”, Spread Sheet.
Science of the eye’s response to long-term near. A correlation of, r = 0.99, is virtually perfect.
Calculation of the “p” value for this study.
THE STANDARD ERROR OF THE ESTIMATE:
P Value Calculated
The “Sum of Squares” is included to verify the r = 0.99 for Dr. Young’s data on six primate eyes.
ERRATUM PAGES FOR, “How to Avoid Nearsightedness”
The side-by-side diode circuit intended to create an open-loop at less-than 0.6 volts. The diodes acted as resistors – and the circuit did not work correctly. This circuit must be replaced by a dead-band circuit, consisting of an operational amplifier, and thee resistors, as shown.
Chapter IV, Figure 4: This circuit is re-drawn from the book. It show how the eye, “latches” or blocks its own recovery from the myopic state.
When the normal eye has a negative state, the image, “lifts off”, the retina, producing a non-linear control system and a blurred image. The diode in this analog computer simulates the clamping effect on the input signal under this condition. This is the major reason that it is so difficult to get the normal eye to move in a positive direction after it has a severe negative focal state.
The Analog Computer, used to predict the eye’s focal status under experimental conditions. Change the error detector resistors to 10k and 10k, and 50k, and 50k. This is to make the gain = 1, for both accommodation and the long-term control of the natural eye’s refractive state.
Transfer Function for the Actuator (Page 69)
Kv / s (Open Loop)
In this case, the “Kv”, is an Integrator. (See Op-Amp wired as an Integrator.)
This can be written, 1 / Tau-Integrator s
K-Integrator / s, Where K = 1/ Tau.
Common practice is to use K, for Bode Plots.
Eo = – [ Ein1 (Rf / Rin1) + Ein2 (Rf / Rin2) + Ein3 (Rf / Rin3) …. ]
None-Inverting (+) Input:
Eo = Ein ( 1 + Rf / Rin )
Inverting (-) Input:
E0 = Ein ( -Rf / Rin )
In the Analog Computer, the error detector must be configured for Gain = 1, in all cases.
The resistors for the Long-term system S/B all 10 k.
The resistors for the Accommodation system S/B all 50 k.