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]
- ^ Stanley Gelfand (19 March 2009). Essentials of Audiology. Thieme. p. 40. ISBN 978-1-60406-155-0.
- ^ Cone of Light Anatomy - "..:: The Tympanic Membrane ::". Archived from the original on 2012-04-05. Retrieved 2011-12-24.
- ^ Advanced Therapy in Otitis Media. PMPH-USA. 2004. p. 56. ISBN 978-1-55009-201-1.
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