Glasses refract light. The lenses in glasses bend light rays as they enter. This bending directs the rays to the retina, helping people see clearly. Without corrective lenses, those with vision issues may experience blurred or distorted images due to improper refraction. Glasses improve vision by enhancing clarity through proper light manipulation.
There are different types of lenses, including convex and concave. Convex lenses are thicker in the middle and are used for farsightedness. They help converge light rays to bring distant objects into clearer focus. In contrast, concave lenses are thinner in the middle and address nearsightedness. They spread light rays outward, allowing nearby objects to be seen more clearly.
The power of the lenses is measured in diopters. Positive values indicate convex lenses, while negative values denote concave lenses. This lens power directly relates to a person’s specific vision needs.
As we delve deeper into the science behind eyeglasses, we will explore various lens materials and coatings. These features not only improve vision clarity but also enhance durability and protection from environmental factors.