Step one. Choose a lens with enough depth to clear the cornea entirely. Scleral lenses by definition do not touch the cornea. If you put a lens on the eye that touches the cornea, it is simply not deep enough. Moving to a lens with greater depth will eventually lead to a lens that clears the cornea entirely.
Guide. An electroencephalogram (EEG) is a test that measures and records the electrical activity of your brain. Special sensors (electrodes) are attached to your head and hooked by wires to a computer. The computer records your brain 's electrical activity on the screen or on paper as wavy lines. Certain conditions, such as seizures, can be seen by the changes in the normal pattern of the brain 's electrical activity.
Evaluation of Brain's Electrical Activity Important in Sleep, Seizures. The electrical activity of the brain is evaluated with an electroencephalogram (EEG) test used in sleep, seizures, coma, and brain death testing. Michel Tcherevkoff/The Image Bank/Getty Images.