Beyond the images his Synesthesia causes, Tyson has 20/20 vision and has full colour vision too.
How long that will last is questionable. Tyson isn’t exactly kind with his eyes. He spends a lot of time in low lighting for the web and sleeps erratic hours that cause his eyes to get dry. A lot of his free time is spent reading in low lighting or staring at a computer screen for hours at a time in, once again, low lighting.
He rubs at his eyes far more than he should. In part, this is because his eyes get sore and dry from staying up for 24+ hours on stakeouts, but Tyson also rubs his eyes as a way to focus himself when suppressing his Synesthesia. And then simply out of habit from rubbing them so often.