A toric soft lens with an RX of -2.00 -1.25 x 120 has the axis resting at the 5 o' clock position. What should the new axis be when the lens is ordered?

In determining the appropriate axis of a toric soft lens, it is important to consider both the prescription (RX) and the current resting position of the lens. In this situation, the given RX indicates a cylinder power of -1.25 and an axis of 120 degrees. When the lens rests at the "5 o'clock position," it corresponds to an axis of 150 degrees in terms of the typical clock face representation.

To effectively reposition the lens so that it correctly aligns with the required 120-degree axis, one must calculate the difference between the current resting position (150 degrees) and the desired axis (120 degrees). Since the lens is sitting at 150 degrees, the goal is to rotate it backward to 120 degrees. This rotation involves moving 30 degrees counterclockwise, as one would go from 150 to 120.

However, in this context, since the lens itself is required to be manufactured with the positioning in mind, you would want to order the lens achieving that axis after accounting for the resting placement. To do so, if the current positioning is moving from 150 degrees back to the 120-degree axis requires an adjustment.

Hence, the necessary axis adjustment results in placing it at an axis of 90