Against the sun, I protect your eyes and am often worn on the face of spies. What am I?

Answer: Sunglasses

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More What am I ?

Agile on my feet, I drive dogs mad. I flick my tail when I'm angry and hum when I'm glad. What am I?
Alcohol makes me thrive and multiply, yet water will kill me. What am I?
All day long it's in and out. I discharge loads from my shaft. Both men and women go down on me. What am I?
Although glory but not at my best. Power will fall to me finally, when the man made me is dead. What am I?
Although I may have eyes I cannot see. I have a round brown face with lots of acne. What am I?
Although I'm far from the point, I'm not a mistake. I fix yours. What am I?
Although it sounds like I work on a transportation device, I actually work in a restaurant. What am I?
Always a part. Never a whole. If only half grows I shrink. What am I?
Always old, sometimes new. Never sad, sometimes blue. Never empty, sometimes full. Never pushes, always pulls. What am I?
Always well dressed, but I never fly. Black and white, sometimes in a tie. I swim and slide, and dance and glide, With one person by my side. What am I?
An action done on mosquito bites. What am I?
Angels and pilots work with me. What am I?