AR coating is necessary for a high index lens!

[children glasses]

Today, people can choose to wear those thin and flat prescription eyeglasses lenses to take place of those thick and heavy ones, that's high index lens, which can bend light harder, however, they both can block more lights than ordinary ones, and that’s the reason why we need to choose anti-reflective coatings as well, the can change the transmissivity as much as 98%! And what's more, most online sites provide such coatings free!

[titanium eyeglasses]

Free: Anti-Scratch Coating WAS A STATEMENT ATTACHED UNDER MY SELECTION OF THE ITEM DS3375 IN RED. THEN, WHEN I WENT TO CHECK OUT, IT ASKED ME TO PAY AN ADDITIONAL 9.95 FOR ANTI-REFLECTIVE COATING???? PLEASE EXPLAIN THIS TO ME. I WOULD REALLY LIKE TO PURCHASE GLASSES TODAY, BUT THIS SEEMS ODD. THANK YOU