He would do something like that. He totally would spend the money on a burrito or a pizza. And yes, there are some cheap places to get glasses now. Eyeglasses are stupid overpriced in brick and mortar establishments. But regardless, Lucas would still need an eye exam.
Now, like I said, there probably are non profits or somewhere he could turn to for free care, but he would have to take the initiative to find them. I assume he still has some sort of social worker. That is the type of thing they could help him with. But Lucas is such a helpless fat ass who can't do anything for himself, probably too lazy to even try to work with the social worker on something like this. He had glasses at one time. How did he get them back then?