Final Answer:
A round segment rotated to the temporal side of the lens refers to the placement of a circular lens segment, often used for corrective purposes, on the temporal (outer) side of the lens.
Step-by-step explanation:
In optics, particularly in eyeglasses, a round segment is a specific area of the lens designed for vision correction. When the term "rotated to the temporal side" is used, it indicates that this round segment is positioned on the outer or temporal side of the lens. The temporal side refers to the side of the lens facing toward the temple of the eyeglasses.
This positioning is often employed in eyeglasses with bifocal or multifocal lenses to address specific visual needs. Placing the round segment on the temporal side allows for a seamless transition between different prescriptions within the lens, providing both distance and near vision correction.