Optego® Training Prism Flippers each include four prismatic lenses. The flipper lenses are constructed using chemically hardened glass (plano base curve), making them more durable and more resistant than plastic lenses. The prismatic power and position is clearly labeled with permanent washable labels; and indicate the combined powers unless yoked or base up/down.
Example A 4^in/4^out = Top 2^in/2^in Bottom 2^out/2^out
Example B 8^in/12^out = Top 4^in/4^in Bottom 6^out/6^out