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The aperture ratio of 57Δ multiplexing prism (MxP) at each eccentricity required for uniform 50% contrast. If the aperture ratio were constant across the MxP, as eccentricities approach the base (nasal) end contrast of the shifted view would be greatly reduced relative to the see-through view. Increasing the aperture ratio toward the base end, as shown, can maintain a constant contrast ratio at all visual eccentricities.
