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Visual optics for brain-computer interfaces (BCIs) has undergone several developments. Currently, visual optics only provides multiple single-light sources, which limit its applications. This study uses several single-light sources to achieve continuous-phase visual optics. This is combined with a liquid-crystal display (LCD) panel to develop an interactive instrument. Although light synthesis is a nonlinear process, the nonlinear problem is solved by increasing the number of light sources. The measurement data confirm that the phase is approximately linear. This interactive instrument is useful in the biomedical engineering field because it predicts user gaze location.