The most common reason for this kind of complaint is due to eye strain. Your son's eyesight has been tested and is normal.His complaint is very localised and he does not have headaches. As his complaint has been going on for some time and can occur when he reads or while he is active it would really be best for him to be seen and tested by a paediatrician. It may be best to take him to see a paediatric neurologist so that a definite diagnosis can be made.
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