<span>A letter to request a certified birth certificate
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The answer is A. interstitial fluid pressure
It is use by Eye Care Professionals To check the eyesight of a person.
If u would have visited a eye care centre u would have noticed a chart like this--
If a person can see all the letters from a distance his eyesight is Perfect.If that person misses a letter or a line from the grid eye treatment or spectacles are given to the person for improving their eyesight
It can help you because if you're not afraid of laughing at yourself then you won't mind as much if people laugh at you and you'll in a way realise that you're also one who makes mistakes this is my aspect on it I ain't saying it's the best answer