I think that everything is OK with your son and that, indeed, this is just a habit he has formed. That being said, as a parent myself, I think it would be best for him to have a full eye exam just to make sure.
There is no reason he can't have a complete eye exam, even though the optician doesn't have the training to do an exam on such a young child.
I pediatric ophthalmologist
will have no problems doing a complete eye exam on your son and will be able to rule out any issues that may be going on with his eyes and effectively treat any that show up.
Does this make sense to you?
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