Otoscopes
The normal eardrum is usually thin, shiny, appears pinkish-gray in color, ... The appearance of the eardrum in acute otitis media is dependent on when the ...
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[per Google: Web Results 1 - 10 of about 142,000 English pages for eardrum reflecting OR shiny OR reflectance OR appearance. (0.18 seconds)]

Also cf. in somewhat different contexts: acoustic reflectance of eardrum
(which does not appear to be the issue here. judging by your limited copntext)

Revision of estimates of acoustic energy reflectance at the human ...
The revised values of eardrum reflectance are somewhat smaller, especially for frequencies above 11 kHz. The reflectance rises from about 0.25 at 4 kHz up ...
www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubM... - Similar pages

Estimation of acoustical energy reflectance at the eardrum from ...
At frequencies greater than 2 kHz the acoustic impedance at the human eardrum is an unreliable indic...
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[ More results from www.ncbi.nlm.nih.gov ]

Determination of eardrum reflectance using measurement of phase ...
At frequencies greater than 8 kHz the acoustic energy reflectance at the eardrum is not well established in living human subjects.
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HTH Tom