The lunula is most visible on which type of nails?

The lunula, which is the crescent-shaped white area at the base of the nail, is most prominently visible on healthy nails. When nails are in good condition, the lunula can appear larger and more distinct, showing a clear contrast against the pinkish tint of the nail plate. Healthy nails tend to have a smooth surface, are free from discoloration or other irregularities, allowing the lunula to be more noticeable.

In contrast, other factors that might affect visibility include nail length or overall health. Short nails may not allow the lunula to be as prominent since there is less nail surface to observe. Long nails might obscure the lunula if they are unkempt or unhealthy. Additionally, while the lunula can sometimes be seen on all types, it's primarily its distinctiveness in healthy nails that makes this answer the most appropriate.