System, apparatus and method for in situ polychromatic measurement of optical properties of topically applied sunscreen

A device for measuring the protection of a sunscreen, the device comprising:

• a light source for emitting light in the spectrum of light from which the sunscreen is intended to protect skin;
• an emitted light conduit for conducting the emitted light to the skin;
• and
• a remitted light conduit for conducting the light remitted from the skin to a photosensor,
• wherein the emitted light conduit and the remitted light conduit are in contact with a region of the skin, and wherein the emitted light conduit and the remitted light conduit are in contact with each other along a distance of at least 2 mm in the region at the surface of the skin.

A device for measuring sunscreen protection, the device comprising:

• at least two optical conduits;
• a cover sleeve surrounding the at least two optical conduits, the cover sleeve having a first end and an opposing second end;
• a hub having a first end and an opposing second end, the second end of the hub being attached to the first end of the cover sleeve;
• and
• a light feed operatively connected to the first end of the hub,
• wherein each of the at least two optical conduits has a flat surface, the flat surface of one of the at least two optical conduits facing the flat surface of the other of the at least two optical conduits,
• wherein the at least two optical conduits include an emitted light conduit for conducting light emitted from the light feed to skin of a patient and a remitted light conduit for conducting light remitted from the skin to the light sensor,
• wherein the emitted light conduit and the remitted light conduit are separated by 10-40 microns, and
• wherein the at least two optical conduits are in contact with a region of the skin and in contact with each other along a distance of at least 2 mm in the region at the surface of the skin.