Using the monovision technique for fitting spherical soft lenses, what is the desired power for the eye fitted for near with a prescription of RX -3.00-0.50 X 180, Add +1.25?

In monovision fitting, one eye is optimized for distance vision while the other is optimized for near vision. To calculate the desired prescription for the near eye, you start with the spherical equivalent of the distance prescription and then add the add power for near vision.

Given the prescription RX -3.00-0.50 X 180, you first convert this to the spherical equivalent. The spherical equivalent can be calculated as follows:

1. From the prescription, obtain the sphere and cylinder components. Here, the sphere is -3.00, and the cylinder is -0.50 at an axis of 180 degrees.
2. The spherical equivalent is calculated by adding half of the cylinder to the sphere: -3.00 + (-0.50 / 2) = -3.00 - 0.25 = -3.25.

Next, to find the power required for near vision, you add the add power to this spherical equivalent:

-3.25 + 1.25 = -2.00.

Therefore, the desired power for the eye fitted for near vision in this monovision setup would be -2.00. This calculation underlines the rationale behind the selected answer, which represents the necessary adjustment