Answer:
I don't have eyes, but once I did see. Once I had thoughts, but now I'm white and empty.
My life can be measured in hours, I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe.
We are five little objects of an everyday sort, You will find us all in a tennis court.
The more of them you take, the more you leave behind. What are they?
You can spin, wheel and twist. But this thing can turn without moving.
I have two eyes in the front and a lot of eyes on my tail
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?