Golden Hue.

 L-R starting from top: Dior, Tom Ford, Prada, Gucci, Alexander Wang, Karen Walker, Miu Miu, 3.1 Phillip Lim, Linda Farrow, Victoria Beckham, Tom Ford, Oliver Peoples, Prada

Speed of light.

Owning a piece of luxury designer item is what some would define as "lucky". As times are getting tough, and we are nearing yet another (possible) economic crisis, consumers need to be more savvy with their spending.

Purchasing a pair of designer sunglasses will take both factors into consideration; owning a piece of designer item and spending wisely!

Some astronomical/scientific facts for you;
1. The sun shines approximately 300 days in Colorado (USA)
2. During 90 days of summer, the sun shines approximately 54 days in Australia.
3. UV Rays from the sun are harmful, sunglasses helps protect your eyes from these harmful rays.

As always, these answers are from google, if you're planning on using these answers on some millionaire quiz show, I'd advise you otherwise =P

Back to the point, sunglasses are a good investment as you will utilise its full potential by wearing them almost everyday! It is by far the most valuable, practical and cheapest option to owning something designer!

If only I practice what I preach *sigh*