The length of the eyeball (either longer or shorter), changes in the shape of the cornea, or aging of the lens can cause refractive errors. Most people have one or more of these conditions. The cornea and lens bend (refract) incoming light rays so they focus precisely on the retina at the back of the eye.
BF series Composite strain gauge. This gauge is designed for measurement on composite materials. It has a specially designed grid configuration to reduce the tightening effect of the gauge to the specimen. As the temperature compensation is available for material with thermal expansion coefficient of 3, 5 or 8ppm/Â°C, this series is recommendable for ceramic, carbon, and composite materials.
composite noun [C]. âº something that is made of âvarious different âparts: The âmain âcharacter in her âlatest ânovel is a composite of several âpublic âfigures of that âera. Scientists have put together a composite âpicture of what the earth's âcrust is like. âº specialized engineering a âmaterial made up of more than one âsubstance that is used for âbuilding things: The âbodies of these âracing âcars are âmoulded from the same composite that is used for making âaircraft.