Questions: If a patient's prescribed axis is 180 degrees and the lens marking is 30 minutes to the fitter's left, what axis should you order? 005 150 015 175

Solution Steps

To solve this problem, we need to understand that the axis of a lens is measured in degrees, and the marking indicates a rotation from the prescribed axis. Since the marking is 30 minutes to the fitter's left, we need to convert this into degrees and adjust the axis accordingly. There are 60 minutes in a degree, so 30 minutes is equivalent to 0.5 degrees. Since the marking is to the left, we subtract 0.5 degrees from the prescribed axis of 180 degrees.

The prescribed axis is given as \( 180^\circ \).

The lens marking is \( 30 \) minutes to the fitter's left. To convert this to degrees: \[ \text{minutes to degrees} = \frac{30}{60} = 0.5^\circ \]

Since the marking is to the left, we subtract \( 0.5^\circ \) from the prescribed axis: \[ \text{adjusted axis} = 180^\circ - 0.5^\circ = 179.5^\circ \] Rounding this value gives: \[ \text{adjusted axis} = 180^\circ \]

Final Answer