Parts 1 through 4 of this series described the importance of determining the visual axis measurement to maximize patient visual comfort and satisfaction with PALs. This final installment introduces methods and devices to obtain that measurement.
Ever heard this? “Seems like I need to rotate my head to read clearly through one of my lenses.” I’ve been annoyed and frustrated when I thought that the lenses I dispensed were measured and fit correctly and yet the patient, the real expert, says, they aren’t. If these lenses were correctly placed, patients would have good binocularity and comfort at near, not the stereoscopic disruption and discomfort that they are experiencing.
In Part 1, we discussed Position of Wear measurements and how they affect compensated power. Now you’ll see why. Are all these measurements necessary? The answer is yes and no. To create compensated lenses, we must use values for one or more of the key POWs.