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What is the possible causes of your child medical condition ?
1. watery eye : eye dryness or eye infection could be a possible cause for such as condition
2. not being able to see the board : could be an early nearsightedness (myopia)
what to do next ?
1. consult an opthalmolgy doctor as soon as possible 
2. do the needed medical tests 
3. treatment options are :
- watery eye : antibiotcis drops , dexamethsone drops (relieve the itching and inflammation) , artificial tears ( relieve the dryness )
- nearsightedness : the intial treatment for such as condition is glasses , as your child is young for surgical options 
what are the needed medical tests ?
1. physical examination
2. eye sight test
3. eye pressure test 
Our advice :
we suggest to consult an opthalamogist as soon as possible and get your child treated as delaying eye medical condition treatment make the matter worse 
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Kind Regards