For Eyeglasses :

How much does this pair of eyeglasses weigh?
This is a relative chart on how light your frames are.

• Less than 10 gm: It is feather light. The specs will stay on your face without you realising that you're even wearing them.

• 10-20 gm: It is light in weight. The specs will not at all hurt your nose and temples. 

• 20-40 gm: Average in weight. Most of the frames are in this weight category. And they are not heavy on your nose.

• More than 40 gm: Above average

Note: Items are measured by Warehouse staff and values are approximate