Terms such as dilated fundus examination, dilated examination, and dilated patient are, sensu stricto, misnomers, because the participial adjective (dilated or undilated) is not meant to modify the following noun but rather the unexpressed noun "pupil". Expressing dilated-pupil + [noun] is a usage nicety in careful writing, although most physicians do not bother, as the meaning is clear to them regardless.
^Parisi, ML; Scheiman, M; Coulter, RS (1996). "Comparison of the effectiveness of a nondilated versus dilated fundus examination in the pediatric population". Journal of the American Optometric Association67 (5): 266–72. PMID8888844.