by Joseph Buttery
Q: Why can't concentric rings (aberrations)of high minus HI (1.74)lenses be minimized? Too much emphasis placed on absolute clarity of vision with little improvement of the visual appearance of the lenses. Surely some coating or tinting can be done. Don't think enough R&D is done here.
A: Hello Joseph,
This is a truly valid question. Indeed for too many people, these rings on high diopters creates aesthetic problems. Thank you for asking.
Well, even if currently is not possible to eliminate this problem completely, there are some small things that can be done to get a decent looking eyeglass.
First, I must tell you that the high index, high diopter lenses are made with rings because this is the only viable solution that keeps the lens features. I mean about: the focal point, distortion free lens, thickness.
As you already know, the spherical minus diopter lens is thicker at the edge and thinner in the middle, and if we add the high density material to have a high index lens, the only way to keep all this in one is with the rings. Without going into technical details, so far this is the only option the manufacturers have to make these lenses.
So, unfortunately, there is no effective solution to make these rings disappear all.
The excellent news is that all the leading companies are working on it. I am confident that, in the near future, a real solution will show up itself.
Higher diameter lenses
Already you can buy now high minus diopter lenses with a bigger diameter, where the rings are at the edge so after grinding will last fewer of them.
About the tinting or other coatings
There is no perfect solution for this problem. Some lenses come with a particular antireflection coating that hides the rings partially but not highly efficient.
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