Which lens would still be acceptable if the distance P.D. were fabricated 5 mm too wide?

In this scenario, understanding how the pupillary distance (P.D.) affects lens fitting is crucial. If the distance P.D. is 5 mm too wide, it means that the optical centers of the lenses are positioned farther apart than what is ideally required. This misalignment will primarily affect the comfort and alignment of the lenses, especially in bifocal or multifocal designs.

Option C, which comprises a +2.00 power lens and a -4.00 power lens oriented at 045 degrees, is still acceptable with a 5 mm wider distance P.D. This is because the overall effect of the lens has a significant amount of relative power difference, which means that the impact of a slight misalignment is less critical for the wearer, particularly if they are not primarily dependent on the distance vision.

The combined prescription in Option C suggests that the individual has a significant degree of astigmatism, and the wide P.D. may not lead to severe visual compromise as it would in a purely distance lens. Additionally, the difference in power may allow for some tolerance when the P.D. is marginally off, especially when considering how the eye adapts to slight discrepancies in alignment.

Understanding the implications of the lens prescription and P.D