Answer:
You'll have to consult an optometrist if you want to improve this.
You feel this sensation when you are dehydrated.
If you have me, you want to tell me. If you tell me, you don't have me.
Mountains will crumble and temples will fall, and no man can survive its endless call. What is it?
I shave several times a day, yet I still have a beard. Who am I?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?