What neurological disorders cause balance problems

Ok so my eye has been hurting since i woke up and then it keeps getting blurry its only left eye and idk what to do

Aperson who doesn't have enough calcium in his or her diet is at risk for developing bones that are weak and break easily. this condition is known as  a.  osteoporosis.    b.  crohn's disease.    c.  celiac disease.    d.  hemophilia.

What would happen if you ate the number of calories of someone who is much taller and more active than you are?