Which of the following parameters indicates a higher astigmatism on the Bitoric lens?

The parameter that indicates a higher level of astigmatism in the context of a Bitoric lens is represented by the choice with the most significant cylinder power. In this case, the -6.00 x 180 prescription indicates a cylinder power of -6.00, which signifies a substantial degree of astigmatic correction required.

Astigmatism occurs when the cornea has an irregular shape, leading to different refractive powers in different meridians. The cylinder component (denoted by the value before the 'x') focuses on correcting the specific orientation of astigmatism indicated by the axis (in degrees). In this scenario, a higher negative cylinder power indicates a greater degree of astigmatism that needs to be corrected, making it evident that the lens described in the first choice requires more significant adjustment to manage the visual distortions associated with higher astigmatism.

The other options, while they do indicate astigmatism, represent lower levels of cylindrical correction, with their respective cylinder powers being -3.00, -2.00, and -1.00. Therefore, they indicate less severe astigmatism compared to the -6.00 x 180 choice, confirming that this latter option is