The PU2B2 Secret Dungeon

FRIENDS~let me share with you something about my course...This is what am I going to use for the rest of my working life o!Have you seen this before?familiar?You can easily see it when you go to optic shop.Till now i still cant imagine I'm actually learning to use this set of lens.

can u see the right hand side---two rows of black lens,they are positve lens(This is for hyperopia).The red ones on the left are negative lens(for myopia).The four rows in the middle(two red&two black) are positive and negative cylinder lens.They are used for astigmatism.confused?Here are some knowledge for you la~