How do glasses function to improve vision?

Glasses function to improve vision primarily through the principle of refraction. When light passes through the lenses of glasses, it is bent or refracted in a manner that helps focus the light onto the retina at the back of the eye. This is particularly beneficial for individuals with refractive errors, such as myopia (nearsightedness) or hyperopia (farsightedness), as the shape of the lenses is designed to correct the focal point of light, allowing for clearer images.

The design of the lens plays a critical role; it is thicker in certain areas, which helps to bend the incoming light more effectively towards the desired focal point. By doing so, glasses ensure that the visual information is properly focused, enhancing overall clarity and helping individuals see better at various distances.

Block UV rays, magnifying images, and changing light color do not directly address the fundamental mechanism of vision correction that glasses provide. These may be functions of some types of eyewear but are not the primary reason behind how glasses improve vision overall.