What is the minus cylinder form of -2.50 +1.00 X 175?

To determine the correct answer regarding the minus cylinder form of -2.50 +1.00 X 175, it is essential to understand how the minus cylinder notation works and how the conversion is performed.

The expression -2.50 +1.00 X 175 indicates that you have a sphere power of -2.50 diopters and a cylindrical power of +1.00 diopters, oriented at 175 degrees. The task is to convert this into minus cylinder form, which typically involves transforming the plus cylinder power into a minus cylinder structure by adjusting the spherical equivalent and changing the orientation accordingly.

In this case, the conversion process starts by taking the spherical power of -2.50 and modifying it with the cylindrical power of +1.00. By subtracting the cylindrical power from the spherical power, you get a new spherical equivalent of -1.50. The plus cylinder at 175 degrees is transformed into a minus cylinder, which involves rotating the axis by 90 degrees. Thus, the new axis becomes 85 degrees.

This conversion leads to the result of -1.50 -1.00 X 85, which aligns exactly with the selected response. Therefore, understanding the adjustment of spherical and cylindrical powers along with the axis