An experiment was designed that demonstrates that in a state of normal binocular vision a low plus sphere fogging the vision to 6/12 (20/40) produces an inhibition of the central foveal cones in the fogged eye. This inhibition is a natural process that can be switched on and off rapidly so that the fovea receiving the clearer image can examine it and hence produce maximum binocular acuity.
Received February 20, 1981; revision received November 19, 1981.
* Optometrist, Ph.D.
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© 1982 American Academy of Optometry