<P> The cone of light, or light reflex, is a visible phenomenon which occurs upon examination of the tympanic membrane with an otoscope . 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 . The apex of the cone is at the most depressed part of the tympanic membrane, known as the umbo . </P> <P> The absence of a cone of light does not necessarily signify an ear disorder, as it could be due to the slope of the tympanic membrane or the shape of the ear canal . However, distortions in the cone of light can also be a sign of increased inner ear pressure or otitis media . </P>

Where is the cone of light located in the ear
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