optical illusion

thing by which the eye is deceived 视错觉; 光错视; 光幻视: A mirage is an optical illusion. 海市蜃楼是一种视错觉. * I thought I saw a ghost but it was just an optical illusion. 我以为我看见鬼了, 其实只是一种幻觉.

opportunity, oppose, opposed, opposite, opposition, oppress, oppress-ively, oppressed, oppression, oppressive, oppressor, opprobrious, opprobriously, opprobrium, ops, opt, opt out of, optic, optical, optical art, optically, optician, optics, optimal, optimism, optimist, optimistic, optimistically, optimization, optimize, optimum, option, optional, optometrist, opulence, opulent, opus, or, or else, or rather,