Answer:
You'll have to consult an optometrist if you want to improve this.
What body part is pronounced as one letter but written with three, only two different letters are used?
What comes in many varieties and can't be seen or touched, but it often makes you move?
What starts with the letter T, is filled with T and ends in T?
It covers you, you lose it every day and you'd die without it.
People take me on walks and I run and have fun. What am I?