According to the report, the cost of installing sprinkler systems to the home builder averaged $1.61 per sprinklered square foot. The cost of sprinkler systems to the home builder, in dollars per sprinklered square foot, rangedfrom $0.38 to $3.66.
A refraction test is usually given as part of a routine eye examination. It may also be called a vision test. This test tells your eye doctor exactly what prescription you need in your glasses or contact lenses.Normally, a value of 20/20 is considered to be optimum, or perfect vision.our doctor may also do this test without the help of a machine. In this case, he or she shines a light into each of your eyes and looks at the amount of light that is bouncing off your retina to measure your refractive score. Afterwards, your doctor will need to determine exactly what prescription you need.
Definition: Refraction (optics) Refraction (optics) Refraction is the phenomenon that causes a light ray to bend when it hits an optical lens surface (or other medium that can act to transmit light e.g. water). Refraction occurs when light strikes the surface of the new medium. As the light enters a dense medium is slows the light wave down. The light is passing from an optical medium (like air) to another optical medium (like glass). As the density of the medium changes the light striking the surface is refracted.