ASD Ds (6) finds some visual stuff difficult, e.g. looking where you point, keeping visual focus on something for more than a few seconds. When he looks for something he will move his whole head - scanning seems hard. After doing something like a puzzle (which is hard for him) he rubs his eyes a lot. Optician said eyesight is fine. But I've heard that Ophthalmologist finds issues that an optician doesn't e.g. eye tracking.
It may just be part of how he is affected by his autism.
Any advice would be great.