The cone of light, or light reflex, is a visible phenomenon which occurs upon examination of the tympanic membrane with an otoscope.[1] Shining light on the tympanic membrane causes a cone-shaped reflection of light to appear in the anterior inferior quadrant. This corresponds to the 4 o'clock to 5 o'clock position in the right eardrum and the 7 o'clock to 8 o'clock position in the left eardrum.[2] The apex of the cone is at the most depressed part of the tympanic membrane, known as the umbo.[3]
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