A previous post described the bark that’s shedding on the crepe myrtles in the F&P backyard.
That’s NOT the only peeling that’s been going on — here’s some of a different sort — my glasses, which are just over 2 years old.
What caused this ?
It’s the coating on the high-index lenses. High-index is a term used to describe plastic lens materials that are thinner and lighter than regular plastic lenses. For a given prescription power and lens design, the factor that determines lens thickness is the index of refraction index of the lens material. Generally, the stronger a prescription (like mine), the thicker the lens material. High-index lenses are nearly 50% thinner than “regular” plastic lenses and can reduce the “eye-shrinking” effect of high prescriptions. The lenses usually have advanced anti-reflective (AR) lens treatment, which are what’s peeling. AND, the higher the index, the higher the lens cost, up to $100 more than plastic lenses.
When the peeling started (and progressively worsened), I returned to the local optometrist where they were bought. The Bad News was that it was past the 1-year warranty, who knew? There was no work-around offered, like removing the AR coating. AND during my on-line search to learn if others had this same problem, it seems that a LOT of folks with high-index lenses and the AR coating, sooner or later had a similar problem, many after expiration of a warranty . Also read where folks purchased products for a do-it-yourself removal project — NOT for me.
Since it was time for my eye exam, makes sense if you will order new glasses, I opted to return to the “regular” plastic lenses sans AR coating. Sure they are thicker (heavier too), but a new frame obscured the larger lenses a bit and these will NOT peel. Glass is also an option, but heavier than plastic and more susceptible to breakage.
After a couple of weeks, I’m used to the new style. It reminds me of Harry Potter; YES, I did enjoy the books and movies too.