A quick follow up to yesterday’s blog post. I was finishing lenses for a patient today and wanted to share a great visual representation of what astigmatism looks like in a pair of glasses.
Below are two images, one is a front view of a lens, in which you can see reflections from the fluorescent lights. You’ll notice how one reflection is “square” with the frame and the othere is on a sharp angle, almost 45 degrees off the first. The first reflection is from the front of the lens, where there is no cylinder/astigmatism correction. The second, severely angled reflection is from the backside of the lens where the cylinder is ground into the lens.
The second image here, shows a side view of that same lens where you can see the variability in lens thickness, which matches the angle and severity of the astigmatism correction.
I hope you’ve enjoyed this update…