This is Ron in Arlington Center, who assured me that he has no intention of retiring any time soon: is shorter hours are a response to having fewer customers because of covid, and he is planning to start being open until 4 and eventually 5 as business picks up. I'd thought he might be easing into retirement -- his website advertises "52 years of experience"-- but he told me he loves his work, and is hoping for another ten years or so. He also gave me a bottle of the eyeglass-cleaning solution I like; it turns out that the reason I hadn't been able to find it online is that the company only sells it to opticians and optometrists. Ron gives it away to his customers, because it wasn't worth the hassle to calculate and pay sales tax at the end of the year. (Massachusetts doesn't charge sales tax on eyeglasses.)
I had lunch at the little Mexican restaurant in Arlington Center, which I ate sitting at one of the tables outside the restaurant, and then took the T to Central Square. Tosci's didn't have any really interesting (to me) flavors, so I got a hit fudge sundae with strawberry ice cream, and didn't get a pint of anything to bring home. Tosci's is now open again at the same location in Central Square, Cambridge (different physical building, on the same block), as well as the store on First Street.
On my way to the optician, I went to CVS and got dry-mouth spray, a hand brace (for sleeping in, the right-handed version of the left-hand brace I already have), and small chemical heating pads.