When choosing a frame for a progressive addition lens wearer, which frame shape should be avoided?

When choosing a frame for a progressive addition lens wearer, the aviator shape with a frame P.D. larger than the patient's P.D. should be avoided because it can create significant visual distortions and compromises the zones within the progressive addition lenses.

Progressive lenses have different areas for distance, intermediate, and near vision, and these areas need to align properly with the user's visual axis for optimal performance. If the frame's P.D. (pupil distance) is greater than that of the patient, it not only may place the lenses in the wrong position but can also disrupt the smooth transition between the different zones of vision within the lens.

Aviator frames typically have a larger width and may not align well with the patient's eye anatomy when designed with a wider P.D. This misalignment is particularly crucial for progressive lenses, as it can lead to blurred vision, discomfort, and diminished effectiveness in the prescribed visual areas, thereby impacting the overall satisfaction and usability of the lenses.

The other options may either have the right P.D. or are more accommodating for progressive lenses, where proper alignment to the patient's optical centers is achievable without inducing unnecessary distortion.