I know there's already a forum for sore and tender scalps but naturally, I can't find it! I needed to register before posting...so it's GONE. For about a year my scalp has been so sore and so tender that it hurts 24 hrs a day. At first I thought perhaps I was allergic to my shampoo so I changed brands. No improvement. Next I wondered if my shower was too hot.
Although small in size, the eye is a very complex organ. The eye is approximately 1 inch (2.54 cm) wide, 1 inch deep and 0.9 inches (2.3 cm) tall. The tough, outermost layer of the eye is called the sclera. It maintains the shape of the eye.
The smallest size visible through the naked eye is generally about 0.1 mm (100 Âµm) and through a light microscope is about 0.2 Âµm (200 nm); anything less than 1 Âµm cannot be seen clearly without an electron microscope. However, living organisms cannot be observed using an electron microscope.