I had these made at a certain shop in August and used them for 4 dives that month. The lens surface was accidentally scratched, but there were no problems underwater. The lens strength is 2.0. I had these made because I couldn't see the LCD screen clearly due to presbyopia when shooting with a TG-6/PT-059. I could also easily see the numbers on my dive computer. The lens can be flipped up and down with hinges. The hinges are made of resin, and the screws are made of stainless steel, so there is no rust. Since the lens has been scratched, I plan to have another one made, so I will sell this one. When I had them made, it was a rush order, and it cost about 10,000 yen. The items for sale are only the frame for Mantis/Mantis 5 with reading glasses and a neoprene lens cover.