If he squeezes his eyes shut tightly does he have a hard time opening them again? If so, it may be the constant muscle firing depleting the muscles of magnesium.

You can try a small dose of magnesium to see it that stops the twitching. The best form is either magnesium citrate or a chelated form like magnesium asporotate. Probably 100-200 mg would be good to start. Too much magnesium can cause loose stools. The other thing you can try is holding a warm washcloth over the eye for a few minutes.

Problems with the ocular muscles are not uncommon in myotonia. An optometrist probably would not be familiar with our condition, but seeing an opthamologist might be good if it persists.

One of my daughters had a lot of eye fatigue and although she didn't have true dyslexia, she had difficulty reading. One of the things that helped her was putting a strip of colored acetate (I think she used red) over what she was reading. She had a vision therapist that really helped her learn how to compensate for the problems.

Jan

Type of Myotonia: Thomsen's

Country: US

Thank you Jan. very very helpful.
Kind regards
Sharmaine

Type of Myotonia: Becker's

Country: South Afrika

Here are a few resources for you. They explain how the colored acetate sheets help. Even if a child doesn't have dyslexia, they can help with eye strain and fatigue which are very common in myotonia because the ocular muscles are affected.


Reading by the Colors

Colored Overlays
(you can find these at office supply or craft stores)


This is similar to one of the aids my daughter used:
Read Assist

Jan

Type of Myotonia: Thomsen's

Country: US