DD8 is great at visual-spatial. She nearly beats me at Blokus and plays with visual math for fun. Constantly. But it's all big-picture whole-page stuff - not linear sequences. She thinks in pictures and 'videos' - when bored, she makes up TV programs and plays them in her head. She seems to track time sequences, and spatial relationships, but not visual sequences.
She eats with her hands when she can get away with it (ie whenever we aren't watching; I think she eats spaghetti with her fingers at school lunchtimes). Apparently this is connected to vision, because eye movement is essentially a fine motor skill. Improving fine motor with fingers also helps improve the control of the eyes.
DD's scores on a bunch of the visual scales were zero or not measurable, and she was below 20th %ile on the rest. Academically, she was keeping up with the class and excelling in some ways. The one clue we had, if we had paid attention, was that she resisted all attempts to give her fine-line markers and kept using the broad-line preschool ones instead. I think they were easier to see.
Keep in mind, I'm not diagnosing your DS; just pointing out that visual skills affect a lot more than vision, so they may be worth screening for even when vision itself doesn't seem to be troubled. Our local developmental optometrist offers a free half-hour screening before a full evaluation. That seems worthwhile. Any dysgraphia in my household has yet to be unambiguously identified or treated, so I can't comment on that.
