Clinical examination

From dermoscopedia

(9 votes)

 Editor: Alon Scope

 Author(s): Alon Scope     ·  Florentia Dimitriou     ·  Ashfaq A. Marghoob     ·  Ralph P. Braun
Description Describes the principleThis glossary term has not yet been described. of clinical examinationThis glossary term has not yet been described..
Author(s) Alon Scope · Florentia Dimitriou · Ashfaq A. Marghoob · Ralph P. Braun
Responsible author Alon Scope→ send e-mail
Status unknown
Status update July 11, 2018
Status by Ralph P. Braun


The clinical "naked eye" examination is important in the assessment of the gross morphological features of the lesion, such as size, shape, colorsThis glossary term has not yet been described., contours, and surface topography.

Since the refractive indexA dimensionless number that describes how light propagates through a medium of the stratum corneum (surface layer of the skinThis glossary term has not yet been described.) is higher than that of air, much of the incident light is reflected off the surface of the skin and causes the surface glareDifficulty seeing in the presence of light that is reflected from the skin surface, as the reflected light overwhelms the retina and precludes the observer from visualizing the light reflected from the deeper layers of the skin. Thus, clinical "naked eye" examination mainly allows the assessment of morphological features of the surface layer of the skin (stratum corneum), and to a much lesser extent, the colors and structuresThis glossary term has not yet been described. of the deeper layers of the epidermis and the superficialThis glossary term has not yet been described. dermis[1].

In body areas with a thick stratum corneum (e.g. on acral surfaces), there is a greater back-scatter of the light and the skin appears more opaque. In body areas with a thin stratum corneum (e.g., eyelids), the skin appear more translucent[1].

naked eye optics

Shiny skin-24433.jpg

This figure shows the clinical exminanation of a pigmented lesion showing the surface glare. The interpretation of the lesion is very limited and difficultneeding much effort or skill to accomplish.

ReferencesThis is material contained in a footnote or bibliography holding further information.
  1. 1.01.1 Braun et al.: DermoscopyThe examination of [skin lesions] with a 'dermatoscope'. This traditionally consists of a magnifier (typically x10), a non-polarised light source, a transparent plate and a liquid medium between the instrument and the skin, and allows inspection of skin lesions unobstructed by skin surface reflections. Modern dermatoscopes dispense with the use of liquid medium and instead use polarised light to cancel out skin surface reflections. of pigmented skin lesions. J. Am. Acad. Dermatol. 2005;52:109-21. PMID: 15627088. DOI.