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Basic control theory equations are developed showing classical exponential system response of refraction vs. time R(t), with a characteristic system time constant τ [100 days +/- 20%] in response to a negative diopter (-) step change of the student’s near-point reading environment. The conclusion is that plus (+) Add lenses, of appropriate strength, +2 D to +3 D, used as reading glasses during study, can prevent the development of myopia progression for college students.

Myopia - A Brief Review. Investigation of +2 D. to +3 D. Reading Glasses to Prevent Myopia