Given K' S 42.00 @ 180/45.00 @ 90 with an RX of -3.00-2.25X 180, which lens design would best correct the wearer's vision?

The correct answer features a lens design that closely matches the keratometry readings of the patient's cornea, which are K' S 42.00 @ 180 and 45.00 @ 90. This indicates that the patient has a steep meridian at 180 degrees and a flatter meridian at 90 degrees.

When selecting a lens design to correct the patient's vision, it is important to consider both the curvature of the lens and the refractive error indicated by the prescription, which is -3.00-2.25X 180. The first part of the prescription indicates a spherical equivalent and the second part includes a cylinder correction that assists in addressing astigmatism.

The chosen lens design of 42.00/45.00-3.00-2.25 effectively replicates the steep and flat meridians of the cornea, ensuring that the lens fits well and provides optimal visual clarity. This design will provide a comfortable fit while also aligning with the necessary optical corrections specified in the prescription, thus allowing for enhanced visual acuity.

In contrast, the other options do not align as effectively with the required optical parameters or keratometry readings of the patient's eye, potentially leading to less optimal vision correction