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has a range of 6,100 seconds of arc stereopsis depth - aquarium images above, below, and even with the image at +30 to +1500 seconds of arc & -25 to -1100 seconds of arc. 16-diopter range for base-in (divergence) training and 24-diopter range for base-out (convergence) training for a total accommodation range of 40 diopters