Which of the following statements best describes the difference between single vision and multifocal lenses?

The distinction between single vision and multifocal lenses is fundamentally based on their design and purpose, which is accurately summarized in the statement that single vision lenses correct for one field of vision while multifocal lenses provide multiple prescriptions in one lens.

Single vision lenses are designed to correct a single visual requirement, such as nearsightedness, farsightedness, or astigmatism, allowing the wearer to see clearly at one specific distance. In contrast, multifocal lenses encompass multiple prescriptions within a single lens, enabling the wearer to transition seamlessly between different visual fields—usually distance vision, intermediate vision, and near vision. This feature is particularly beneficial for individuals who require vision correction for various tasks, such as reading, working on a computer, and driving, all without the need to switch different pairs of glasses.

The other options do not accurately capture the primary differentiation between these lens types. For instance, the relative thickness of the lenses is influenced by factors such as the prescription power and lens material rather than the nature of the lenses being single vision or multifocal. Additionally, both lens types can provide magnification depending on their prescription strengths, and both are designed to cater to various visual needs rather than being limited to just one function, like reading or distance viewing