There are nine different essential oils in RC Blend. They are listed below along with a brief description of each oil. 1  Eucalyptus globulus Essential Oil - is one of many eucalyptus essential oils.  Eucalyptus radiata Essential Oil (Black Peppermint Oil) or Black Peppermint Oil is one of many eucalyptus essential oils.
Biology: We have cones! it is a part of our eye (on the retina, in the fovea). Cone cells, or cones, are one of the two types of photoreceptor cells that are in the retina of the eye which are responsible for color vision as well as eye color sensitivity (WIKIPEDIA)
<b>Rods r</b><b>espond to very low levels of light and are primarily responsible for night vision.</b><br /> They also: <br /> A Rod Cell is a type of light-sensitive nerve cell found in the retina. <br /><br /> Rod cells do not process fine details or colour differences but are highly sensitive to light.