My Effective Design Idea

I was thinking about doing my piece on prescription glasses. Reasons for this are that they fit their purpose, they are specific to the individuals needs by the size, prescription and taste.
I need to identify the designer/ inventor and the date.
Benefits include:

• Allow you to see
• Stays on face allowing constant vision without hassle
• Different patterns and designs to fit the different needs or desires 
• Comfort fit ti you personally - Nose and ear pads.

Effective design should add use and meaning, should serve a purpose and should be reliable.

Personally I think the prescription glasses fit all of these.