If you don't find what you need on our site, please contact us so we can assist you. Starbucks Online Store Customer Service Team. Customer Service Team hours are Monday through Friday, 5:30 a.m. - 5:00 p.m. PT, Saturday, 7:00am - 3:30pm PT, Sunday, closed. Call us toll-free at 1-877-421-9062. Contact the Starbucks Online Store Customer Service Team via e-mail using the form below:
The smallest particle visible to the naked eye is 40 microns. To give you some perspective, a piece of hair's width can range from 40 to 120 microns.
Simple eye in invertebrates. A simple eye (sometimes called a pigment pit) refers to a type of eye form or optical arrangement that contains a single lens. A simple eye is so called in distinction from a multi-lensed compound eye, and is not necessarily at all simple in the usual sense of the word. The eyes of humans and large animals, and camera lenses are classed as simple because in both cases a single lens collects and focuses light onto the retina or film.