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
Don't really worry about pushing too hard, it's even ok if you were to break a rib or two. it's better to push too hard than not hard enough
Fewer job opportunities for the mother, unfortunately, especially if she is pregnant, because people judge, and they won't think she is responsible since she is underage and with child. With the father, it's not like they'll know right away, and they can just walk away and not be bothered with the subject again, while the mother will have to find a job and either manage to balance school, or drop out. The parents don't have to do anything, but they can support there children, but it's still not going to affect if they get job offerings or not.
Answer:
the better health of a person and the vitamins his/her body contains recommends for the average person