Magnifying glass
A magnifying glass is the lens through which you can look to make things appear bigger, so you can see am better.
The magnifying glass consists of the piece of convex-shaped glass or plastic. It has to be held at the right distance between the eye and the object. The magnifying glass usually comes with the handle. A telescope is the more advanced kind of magnifying glass and consists of at least two glass lenses.
A pair of binoculars is like the telescope for each eye. Spectacles or eyeglasses also use lenses to correct the person's vision.