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Synoptophore slides to evaluate retinal misregistration (10-degree targets pictured). One eye views five boxes, with four boxes oriented at the ends of a plus sign (Top). The other eye views 5 ×'s positioned to exacly superimpose on the five boxes (Middle). When the 4 periperal ×'s superimpose the 4 peripheral boxes, no retinal misregistration is present. When one of more of the peripheral ×'s do not align with the boxes (Bottom), retinal misregistration is present.
