Analyzing the laser‐light reflection from human hair fibers. II. Deriving a measure of hair luster

Wortmann, Franz; Wiesche, Erik Schulze zur; Bourceau, B.

doi:10.1111/j.0142-5463.2004.00223_6.x

Cited by 20 publications

(18 citation statements)

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“…Surface reflected light is light which hits the hair and reflects on the surface of the cuticle and appears as shining white [ Figure 1 ]. [ 9 ] The quality of the light band depends on the hair color[ 10 ] and inhomogeneity of the hair microstructure,[ 11 ] but it also depends on the volume of hair.…”

Section: Discussionmentioning

confidence: 99%

A new classification of early female pattern hair loss

Kaneko

2018

Int J Trichol

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Background:Global photographs (GPs) have been widely used to grade the severity in female pattern hair loss (FPHL). However, existing classifications for FPHL are not useful in the evaluation of early FPHL. Although there are some variations in early FPHL, even to a mild degree, all types of early FPHL are included in just one category. Therefore, the authors have devised a grading system for early FPHL with five levels focusing on the changes revealed by the surface reflected light of flash generated on GPs.Aims:This study aims to examine the possibility of evaluating the treatment course of early FPHL using the grading system based on changes in hair surface reflection patterns.Subjects and Methods:Retrospective chart review of 114 early FPHL patients was performed. GPs of these patients were classified into five grades. Photographs of the lowest and the highest grades of each patient were selected and paired. First, the relevance between the value of FPHL-severity index (FPHL-SI) and grades of all the selected photos was analyzed. Next three volunteers graded the paired photographs and chose the milder degree, and then, the concordance rate among author's and volunteers' evaluations were analyzed.Results:The value of FPHL-SI and incidence rate of hair diameter diversity tended to rise along with increasing of GP grade. Concordance rate of grading among author and more than two volunteers was 57%. The concordance rate of course evaluation between author and two volunteers was 97%.Conclusion:The new classification can finely classify the grade of early FPHL and can be used for treatment course evaluation.

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Section: Discussionmentioning

confidence: 99%

A new classification of early female pattern hair loss

Kaneko

2018

Int J Trichol

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“…A shinier dark hair (i.e. glossy) is probably perceived darker than a less shiny fibre of same L* value, as evidenced by some physical experiments [12][13][14]. The dual approach exposed here (subjective vs. objective) has been extensively studied by the textile industry (www.hunterlab.com, www.industrial.dataclor.com) where matching coloured fabrics is of a high concern.…”

Section: Discussionmentioning

confidence: 99%

The diversity of the human hair colour assessed by visual scales and instrumental measurements. A worldwide survey

Lozano

Saunier

Panhard

et al. 2016

Intern J of Cosmetic Sci

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“…In this case, all panelists had not experienced perming to change their hair style. The quantitative evaluation of hair appearance (luster) has been studied and various methods for the evaluation have been proposed based on goniophotometric measurements [2,3,[5][6][7]9,10,12,13,17] and on digital imaging methods [4,8,18,20,22] including computer graphics [19,23]. The digital imaging methods are useful to understand the relationship between hair structure and hair appearance intuitively via two-dimensional image analyses.…”

Section: Alignment Of Multiple Hair Fibersmentioning

confidence: 99%

Hair Structures Affecting Hair Appearance

Nagase

2019

Cosmetics

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Optical factors affecting hair appearance are reviewed based on hair structures from macroscopic to microscopic viewpoints. Hair appearance is the result of optical events, such as reflection, refraction, scattering, and absorption. The effects of hair structures on such optical events are summarized and structural conditions for hair appearance are considered. Hair structures are classified into the following: the alignment of multiple hair fibers, the cross-sectional shape of the hair fiber, and the microstructures of hair fiber (cuticle, cortex, and medulla). The alignment of multiple hair fibers is easily affected by the existence of meandering fibers and their alignment along hair length becomes less-synchronized. The less-synchronized orientation of multiple fibers causes the broadening of the apparent reflection and luster-less dull impression. The cross-sectional shape of hair fiber affects light reflection behavior. Hair fibers with elliptical cross-section show glittering colored light based on total reflection in the hair. The scaly structures of cuticles at the surface of hair are often uplifted and cause light scattering, and then affect hair luster. The porous structure of the cortex and medulla in hair fiber can cause light scattering and affect hair luster and color. The above phenomena suggest that important factors for hair appearance are the alignment of multiple hair fibers, appropriate cross-sectional shape, ordered scaly structure, and pore-less internal structure.

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Analyzing the laser‐light reflection from human hair fibers. II. Deriving a measure of hair luster

Cited by 20 publications

References 5 publications

A new classification of early female pattern hair loss

A new classification of early female pattern hair loss

The diversity of the human hair colour assessed by visual scales and instrumental measurements. A worldwide survey

Hair Structures Affecting Hair Appearance

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