The first time you put on progressive glasses, the center of the lens looks sharp and the floor appears flat, but any quick glance to the side smears the world into a soft streak....
READ MORE
The starting point for freeform production is a semi-finished lens, also known as a puck due to its resemblance to an ice hockey puck. These are produced in a casting process that is also used to manufacture stock lens. The semi-finished lens are produced in a casting process. Here, liquid monomers are first poured into moulds. Various substances are added to the monomers, e.g., initiators and UV absorbers. The initiator triggers a chemical reaction that leads to hardening or “curing” of the lens, while the UV absorber increases the UV absorption of the lens and prevents yellowing.
The first time you put on progressive glasses, the center of the lens looks sharp and the floor appears flat, but any quick glance to the side smears the world into a soft streak....
READ MOREWho Should Wear Progressive Lenses: The Short Answer Progressive lenses belong on the face of anyone who needs three working distances in one frame and is willing to give the desi...
READ MOREA 63-year-old machinist picks up his first pair of progressive lenses. Two weeks later he comes back with a strange complaint: straight ahead, everything is crisp, but every time ...
READ MOREA woman in her late forties holds a restaurant menu at arm's length, gives up, and asks the person across the table to read it aloud. Three months later she is sitting in a fittin...
READ MOREA 52-year-old office manager reads a spreadsheet on her monitor, glances at the printed invoice in her hand, then looks across the room at a colleague walking in. Three distances,...
READ MORE