Cone of light Cone of light 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. The absence of a cone of light does not necessarily signify
Common name in English, including “stone curlews”, so the choice of the name “thick-knees” is not easy to defend but is a clear illustration of the hazards of the facile coinage of terminology. For collective nouns for various subjects see a list of collective nouns (e.g. a flock of sheep, pack of wolves) Some organizations have created official lists of common names, or guidelines for creating common names, hoping to standardize the use of common names. For example, the Australian Fish Names List or AFNS was compiled through a process involving work by taxonomic and seafood industry experts, drafted using the CAAB