If there was a PAL fitting height of 24 mm for each of the following, which lens shape would be your last choice for a PAL?

In the context of progressive addition lenses (PALs), the fitting height is crucial because it determines how well the various zones of the lens align with the wearer's pupillary height and their visual needs. Each lens shape has its implications for fitting heights and the effectiveness of the lens design.

Aviator frames typically have a distinctive shape that includes a wider lens area at the top and a more tapered bottom. While they have a stylish aesthetic, the larger height might not work well with a fitting height of 24 mm, which is relatively low compared to the overall size of the lens. This shape tends to require a higher fitting height to optimize the progressive areas, making it less suitable at this particular measurement.

In contrast, round, oval, and octagonal shapes have more balanced distributions of height and can accommodate a lower fitting height much more effectively. These shapes can position the optical zones more effectively relative to the eyes, allowing for better visual performance across all lens sections. Thus, the aviator shape, with its design characteristics, would be the last choice when considering a fitting height of 24 mm for PALs.