But that doesnât actually tell us what the difference is between the two. In reality, the difference between local and central fire alarms for renters insurance is based on who they alert. A local fire alarm sends a signal, usually a rather obvious noise that alerts residents of the apartment or building in question.
For other uses, see Cornea (disambiguation) . The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. The cornea, with the anterior chamber and lens, refracts light, with the cornea accounting for approximately two-thirds of the eye's total optical power.In humans, the refractive power of the cornea is approximately 43 dioptres. While the cornea contributes most of the eye's focusing power, its focus is fixed.The curvature of the lens, on the other hand, can be adjusted to tune the focus depending upon the object's distance.n humans, the refractive power of the cornea is approximately 43 dioptres. While the cornea contributes most of the eye's focusing power, its focus is fixed. The curvature of the lens, on the other hand, can be adjusted to tune the focus depending upon the object's distance.
Because the cornea is as smooth and clear as glass, but is strong and durable, it helps the eye in two ways: 1  It helps to shield the rest of the eye from germs, dust, and other harmful matter. 2  The cornea acts as the eyeâs outermost lens. It helps to shield the rest of the eye from germs, dust, and other harmful matter. 2  The cornea shares this protective task with the eyelids, the eye socket, tears, and the white part of the eye (sclera). 3  The cornea acts as the eyeâs outermost lens.