Where is the peripheral optical zone located in relation to the contact lens?

The peripheral optical zone of a contact lens is located adjacent to the central optical zone. This is significant because the central optical zone is primarily responsible for providing clarity and sharp vision, while the peripheral optical zone plays a supportive role, contributing to overall lens comfort and stability on the eye. The design of contact lenses often incorporates a gradient of optical powers, with the central zone being more optimized for vision correction and the surrounding peripheral zone aiding in lens movement and alignment with the cornea.

Understanding this relationship is crucial for lens fitting and performance, as an adequately designed peripheral zone can enhance tear exchange under the lens and reduce the chances of lens-related discomfort. In contrast, the other options, such as being located at the base or edge of the lens or within the central zone, do not accurately describe the functional and anatomical relationship of the peripheral zone to the rest of the lens structure.