What is the transposed prescription for - 3.50 + 2.00 x 137?

To determine the transposed prescription for -3.50 + 2.00 x 137, it's essential to apply the rules of prescription transposition. When transposing a prescription from plus-cylinder form to minus-cylinder form (which is what is being asked), we need to change the sign of the sphere value, adjust the cylinder value accordingly, and change the axis value.

Starting with the original prescription:

• Sphere: -3.50

• Cylinder: +2.00

• Axis: 137 degrees

When transposing:

1. Change the sphere from -3.50 to +1.50. This is done by adding the cylinder value to the sphere value (-3.50 + 2.00 = -1.50).

2. Since the cylinder is +2.00, to find the new cylinder value after sign adjustment, we change it to -2.00.

3. For the axis, you need to add 90 degrees to the original axis because we are switching from plus-cylinder to minus-cylinder. Thus, 137 + 90 = 227 degrees. However, since the axis of the cylinder must be between 0 and 180 degrees, we subtract 180 to fit it within this range.