Checklist: if a child routinely exhibits any of these signs it's time for a check-up:
Holding a book very close ( 15 - 20 cm away ).
Holding their head at an extreme angle to the book, while reading.
Covering one eye while reading.
Squinting when doing near work.
Sitting badly when working close.
Moving head back and forth while reading instead of just using eyes.
Poor attention span, drowsiness after prolonged work, less than an arm length away.
Requiring longer reading time for completing homework than it should.
Seeing blurring or double image while reading or writing or when work is hard.
Losing place when moving gaze from desk work to white board or copying text.
Using marker / ruler / finger / to keep their place while reading.
Writing up or down hill, irregular letter or word spacing.
Reversing letters ( b for d ) or words ( saw for was ).
Re-reading or skiping words or lines unknowingly.
Failing to recognise the same word in the next sentence.
Misaligning digits in columns of numbers.
Headaches after reading.
Burning or itching eyes after doing near vision work.
Blinking excessively when doing near work, but not otherwise.
Rubing eyes during or after short periods of reading.
Declining Comprehension as reading continues
Failing to visualise ( cannot describe something they have just read about ).