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Bilateral horizontal 40Δ peripheral prisms. Since both eyes have the same prism views, the prism apical scotomas remain in the binocular view. (A) Simulated Goldmann diagram shows field substitution, not expansion. (B) The corresponding percept diagram shows no visual confusion, as the view from each eye is the same. Images from the blind side are merely shifted to displace areas of the seeing hemifield.
