Ocular-Focus Stimulator
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Ocular-Focus Stimulator

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The simple instrument described in this letter performs the following function. When it is pointed at any object, test pattern, or other form of visual display, the optical distance between the observer and the object can be changed at will while the brightness and visual angle of the object are invariant. Further, the observer sees the object through a pupil of any desired shape and transmittance.

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