Post on 29-Oct-2015
description
Evaluation of a Novel Skin Type
Meter and the Correlation
between Fitzpatrick Skin Type
and Skin Colour
1. School of Medicine, Swansea University, UK
2. CyDen Ltd, Swansea, UK
3. Independent Laser Protection Advisor, Haywards Heath, UK
4. Molholm Hospital, Vejle, Denmark
Caerwyn Ash PhD1, Stuart Jones2, Godfrey Town3,
Marc Clement PhD1, Peter Bjerring MD PhD4,
Sam Webster PhD1, Richard Hugtenburg PhD1
Mike Kiernan PhD2
Why is Skin Tone Important to Understand
Understanding and measuring epidermal melanin concentration
limits the output parameters of IPL/Lasers to prevent or severely
reduce the risk of adverse reactions
Human Skin Optics
Type 1 White: Always burns, never tans very pale
Type 2 White: Usually burns, tans eventually
known as Celtic skin, often has freckles.
Type 3 White: Sometimes burns tans quite well in
sunlight
Type 4 Moderate Brown: Hispanic/Mediterranean
skin, naturally darker olive skin tans well
Type 5 Dark Brown: cultural background is Asian Middle Eastern very sensitive to sunlight
Type 6 Black: Cultural background is Afro-
Caribbean and is very sensitive to sunlight
Skin Tone
The Zebrafish Device
The Study
Questionnaire
Swansea University Ethics Approved Study
120 Anonymised Subjects
Exclusion criteria = psoriasis, dermatitis
The Study
Measurement Data
Zebrafish Measurement
Cortex RGB Measurement
Photo of treatment area
Results
The results show no/limited correlation between the questionnaire
derived Fitzpatrick skin type and the self assessed skin tone.
Results
Graph shows the correlation of the zebrafish prototype to the estimated skin type derived from the photographs of the Boots colour chart against measurement area.
Results
Graph shows the correlation between the prototype zebrafish prototype and the RGB values of the Cortex DSM II ColorMeter.
Results
Results
Graph showing the variation of skin states on the Zebrafish prototype 4.5% Std Dev
Results show that the zebrafish pigmentation index shows good correlation to a subjects skin colour.
Further, the results show that Pigmentation index is an improved method of determining IPL/laser parameters for cosmetic
IPL/laser treatments as it directly relates to the subjects melanin
concentration, intra-body melanin distribution.
The Fitzpatrick skin type was incorrect of 71.4% subjects using a Boots colour chart and genetic deposition key when compared to
a questionnaire derived Fitzpatrick value.
Fitzpatrick skin typing is not a good indication of the probability of adverse reactions using IPL/laser hair removal treatments.
Further testing is currently being undertaken
Discussion
Summary Summary
1. Fitzpatrick skin typing is not optimal as a tool to determine
IPL treatment parameters.
2. Pigmentary Index is a better indication of the level of risk to
adverse reactions, we propose to use this index before
treatment even of different body locations
3. The Zebrafish system is proven to correlate with estimate
skin tone based on 120 subjects of various ethnicity, but
more work is required
Consumer Diagnostic Devices
Consumer are familiar with diagnostic equipment
Thank You