Rupert Grint lined his left eye together with his hand and tried to learn the highest few traces. “E, D, F, C, E, F,” he stated slowly.

“Shut!” stated Marilyn Blumengold, a gross sales affiliate at Moscot, the eyewear store on the Decrease East Aspect.

This was on a latest snowy afternoon. Mr. Grint, at the moment taking pictures the fourth season of the Apple TV+ horror drama “Servant,” had pushed in for the weekend from his momentary residence in Philadelphia to absorb the sights and perhaps even have his eyes checked. He had observed a blur in the proper one, he stated.

However Moscot, which has been in enterprise for greater than 100 years, didn’t have an optometrist on-site on Sundays, so Mr. Grint, 33, improvised his personal check, standing about 20 toes away from an eye fixed chart in the back of the shop.

“Virtually 20/20,” Ms. Blumengold stated encouragingly.

Glad for the second, Mr. Grint turned his consideration to selecting an eyeglass body, shifting by way of the shop shyly, unassumingly, by no means asking for assist, but additionally by no means declining it.

“I’m a really non-public particular person, an introvert,” he stated. He slouched by way of the shop in a black Issey Miyake go well with {that a} stylist had picked out for the outing. “Unusual pajamas,” he referred to as them. “Surprisingly, I feel they give the impression of being good.” His pink hair flopped excessive of some frames.

Mr. Grint appeared overwhelmed. “There’s simply a lot alternative,” he stated, as he surveyed the rows of show circumstances. He stated it twice. “It’s fairly ‘Harry Potter,’” he added with none prompting. “Like selecting a wand.”

Mr. Grint ought to know. He starred as Ron Weasley in all eight “Harry Potter” movies. (Ron’s wand? Willow. With a core of unicorn hair.) Ms. Blumengold could or could not have recognized that — at one level she steered him towards a pair of spherical black glasses, a $300 mannequin referred to as the Zolman, which appeared very Harry-esque.

“No,” Mr. Grint stated politely.

When the “Harry Potter” movies ended, Mr. Grint was nervous that he could not make it as an grownup actor. He knew learn how to play Ron, Harry’s courageous, anxious sidekick. He didn’t know if he might play anybody else. “I undoubtedly did suppose, ‘Is it too late to select one thing else?’” he stated.

He purchased a pink-and-white ice cream van, which he drove again to his household residence simply north of London on his final day of taking pictures. He thought briefly that he might make a go of that.

However after taking a 12 months off, he tried appearing once more. He had been despatched a whole lot of “Potter” adjoining materials — extra sidekicks — however he held on for edgier, extra severe, extra grownup work. He took an element in a Jez Butterworth play, having fun with the self-discipline of theater, and starred within the Crackle crime dramedy “Snatch.”

His most important post-“Potter” position has been in M. Night time Shyamalan’s “Servant,” a creepy drama on Apple TV+ a few Philadelphia couple who rent a nanny to take care of a child that’s really a remedy doll. (The true child had died in an accident.) Mr. Grint performs Julian, the child’s supercilious uncle. “It’s fairly a troublesome topic, particularly for those who’ve obtained a child,” he stated.

Midway by way of the collection, within the spring of 2020, his companion, the actress Georgia Groome, gave start to their daughter, Wednesday G. Grint. “Having a baby halfway by way of undoubtedly made me perceive what a loss that will be,” he stated.

Wednesday had made him right into a little bit of a hypochondriac, he added. (Engaged on a present during which horrible issues occur to our bodies in almost each episode — self-harm, self-flagellation, being buried alive — most likely hasn’t helped.)

“That’s why I needed to have an eye fixed check,” he stated. “I’m slowly changing into extra conscious that there’s plenty of shifting elements within the physique.”

This season’s finale airs on March 25, however Mr. Grint has already begun filming the present’s fourth and last season. And, no, he has no concept what the twist can be. “It’s fairly a thrill to work that means.” (It have to be. He has signed on for Mr. Shyamalan’s subsequent movie, “Knock on the Cabin.”)

Ms. Blumengold began him off with a traditional Moscot mannequin, the Lemtosh, a brown acetate oval body with a slight Fifties vibe. Most of the frames have Yiddish names, although “Lemtosh” simply feels like one. Mr. Grint appeared confused as he squinted at himself within the mirror. “It adjustments your look,” he stated. “It adjustments your character.” Into what, he wasn’t certain. However he felt that he might already see a bit higher.

“Very good,” Ms. Blumengold stated. “Very good-looking.”

Then he tried on a dozen extra acetate frames, toggling between rounder fashions together with the Genug (Yiddish for “sufficient”) and Frankie, and rectangular ones like Kitzel (“tickle”) and Shindig, a retro unisex mannequin. Most value round $300.

“I do wrestle with making selections,” he stated. “It’s fairly a duty, selecting.”

After 40 minutes, he settled on the Yukel (“buffoon”) a clubmaster model with a thick tortoiseshell browline and a thinner gunmetal backside.

Ms. Blumengold created a buyer profile and added it to his file, in case he does find yourself needing eyeglasses. He might at all times name in his eye check outcomes and have the glasses made.

However Mr. Grint didn’t wish to go away empty-handed, so he set his sights on the sun shades. After flirting with the Boychik (a time period of endearment for just a little boy), he turned again to the Lemtosh, this one in brown acetate frames and darkish brown lens. In spite of everything, Mr. Grint is now a person.

As he waited for Ms. Blumengold to field the glasses up, he popped outdoors for a fast vape hit. When he returned, she handed him a chamois material to wash them with. “That is your final Yiddish phrase for the day,” she stated. “‘Shmatte,’ a rag.”