An axle is a central shaft for a rotating wheel or gear. On wheeled vehicles, the axle may be fixed to the wheels, rotating with them, or fixed to the vehicle, with the wheels rotating around the axle. In the former case, bearings or bushings are provided at the mounting points where the axle is supported.
A visual aid is something that supplements words with a picture, chart, or illustration. Looking at an image of the brain and the optic nerve as you read about it is a good example of a visual aid. It is a supplement to the words you're reading. Let's look at why you should use visual aids when you give a speech and the best ways to use them. Why Use Them. Imagine that you are going to present information to one of your classes.
Visual impairment, also known as vision impairment or vision loss, is a decreased ability to see to a degree that causes problems not fixable by usual means, such as glasses. Some also include those who have a decreased ability to see because they do not have access to glasses or contact lenses. Visual impairment is often defined as a best corrected visual acuity of worse than either 20/40 or 20/60. The term blindness is used for complete or nearly complete vision loss. Visual impairment may cau