What is a common characteristic of corrective lenses?

Corrective lenses are designed to refract light in a way that enhances vision by helping to focus images precisely on the retina. This refraction process corrects vision issues such as nearsightedness, farsightedness, and astigmatism, allowing individuals to see more clearly. The shape of the lenses is engineered to bend light rays appropriately, ensuring that they converge at the right point on the retina for optimal visual acuity.

The other options do not accurately represent common characteristics of corrective lenses. While some corrective lenses may indeed be tinted, this is not a defining characteristic, as many are not tinted at all. Moreover, corrective lenses can be made from a variety of materials, including glass and polycarbonate, not just plastic. Lastly, corrective lenses are available in various styles and customizations to fit individual prescriptions, rather than being limited to standard sizes.