lens. 1  a piece of glass, or other transparent substance, with two curved surfaces, or one plane and one curved, regularly bringing together or spreading rays of light passing through it: a lens or combination of lenses is used in optical instruments, eyeglasses, etc. to form an image.ens-Computer Definition. The glass or plastic elements that focus light onto analog film or a digital sensor in a still or video camera. Lens quality is just as important in digital cameras as it was in the Daguerreotype cameras in the 1800s.
The FitnessGram Pacer Test is a multistage aerobic capacity test that progressively gets more difficult as it continues. The 20 meter pacer test will begin in 30 seconds. Line up at the start. The running speed starts slowly, but gets faster each minute after you hear this signal. [beep] A single lap should be completed each time you hear this sound. [ding] Remember to run in a straight line, and run as long as possible.
Researchers recruited 50 healthy volunteers to test four popular fitness trackers for a study published this week in JAMA Cardiology. They connected volunteers to an electrocardiogram (EKG), which is the most accurate way of measuring heart rate. Then, volunteers wore the trackers â the Apple Watch, Mio Fuse, Fitbit Charge HR, and Basis Peak â while exercising on a treadmill at 2, 3, 4, 5, and 6 miles per hour.