Elder, 1997  Title: Anatomy and physiology of eyelash follicles:
relevance to lash ablation procedures.
Authors: Elder MJ
Journal: Ophthal Plast Reconstr Surg 1997 Mar;13(1):21-5
PMID: 9076779
Affiliated institution: Moorfields
Eye Hospital and Institute of Ophthalmology, London, England.
Cited in:
BACKGROUND: This study aimed to define the anatomy of the eyelash
follicles in order to improve methods of selective lash ablation.
MATERIALS AND METHODS: Dimensions of eyelash follicles were determined
from histological specimens of the upper and lower lids of 10
patients. For one of these patients, the eyelash follicles were
categorized as quiescent or actively growing, according to standard
hair-cycle morphology. RESULTS: Follicle dimensions were (mean
+/- SD): upper lid follicle depth, 1.8 +/- 0.3 mm; bulb width,
188 +/- 44 microns; shaft width, 205 +/- 28 microns; lower lid
follicle depth, 0.9 +/- 0.2 mm; bulb width 132 +/- 19 microns;
and shaft width, 158 +/- 26 microns. The upper lid comprised 41%
active follicles compared to 15% in the lower lid. CONCLUSIONS:
There are significant differences in the anatomy of the follicles
between the two lids. For an electrolysis needle to completely
contact 95% of all follicles, it must be inserted 2.4 mm into
the upper lid and 1.4 mm into the lower lid (mean depth +2 SD).
Argon laser ablation requires a beam width of < 200 and <
250 microns for the lower and upper lids, respectively, to treated
similar depths as electrolysis. The higher proportion of actively
growing upper lid follicles explains why upper lid lashes are
longer.
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