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In this scenario, the lensometry results indicate that the first line coming into focus at -1.50 diopters suggests a cylindrical component focused on the same axis. The appearance of the triple lines, typically referring to the presence of a spherical component, indicates that at zero, the lens is essentially neutral along that axis.

The notation for lenses generally follows the format of sphere (spherical power) followed by cylinder (cylindrical power) and its respective axis. Given that the only cylindrical power that is referenced is -1.50, and it is indicated to be measured on the axis at 180 degrees, it aligns with the typical practice of writing this format.

The notation PLANO would indicate a zero spherical power, which is not the case here since there is a focus at -1.50 before reaching zero. Similarly, the options that include a positive cylindrical power or indicate a different axis would not accurately reflect the values provided in the question.

Thus, stating the lens power as -1.50 along the axis at 180 degrees accurately reflects the data obtained from the lensometry, making this the logically correct choice.