In a segment bifocal, where is the reading portion typically located?

In a segment bifocal, the reading portion is typically located at the bottom of the lens. This design allows for a clear distinction between the distance vision area and the near vision area, which is particularly useful for individuals who need correction for both distance and near sight. The lower segment is positioned conveniently for reading or other close-up tasks, as it allows the wearer to look downwards without having to tilt their head excessively, thereby maintaining a comfortable and natural posture while engaging in near visual activities.

The other locations mentioned, such as the center, top, or side of the lens, are not typically utilized for the reading portion in a segment bifocal. Placing the reading portion in these areas would not provide the same level of convenience or accessibility for the visual needs commonly addressed by bifocals. Thus, the design of having the reading segment at the bottom optimally serves its intended purpose.