Glasses primarily refract light. When light passes through the lenses of glasses, it bends due to the change in medium from air to glass. This bending of light is known as refraction, which is responsible for correcting vision.
However, it’s worth noting that some light is also reflected off the surfaces of the lenses. This is especially true if the lenses are not coated with an anti-reflective coating. In that case, you may see a glare or reflection off the lenses, which can result in less light reaching the eyes.
In summary, while glasses do have some reflection, their main function is to refract light to help individuals see better.