When an Optician Refuses to Sell Glasses

Working at an optical shop, there are times when I refuse a sale.
This isn't because the customer is being abusive or causing some kind of trouble.
It's simply because glasses cannot solve the problem.

“My vision has suddenly become blurry.”
“So, adjust the prescription for me.”
When I measure their vision after being told that, the numbers are far off from their current glasses. Even if they wore glasses with that prescription, their visual acuity would only be about 0.5.
This wouldn't even pass a driver's license test.
They must have had trouble seeing even before reaching this point. Well done on making it this far, hero.

I tell them the results directly, explaining that changing the prescription won't improve things, and suggest they visit an ophthalmologist because there might be an underlying eye disease. Then they say,
“Do something about it!”
“I don't want to go to an eye doctor!”
I feel like using a full-force uppercut with my right hand to smash their eyeballs along with those glasses (self-censored).

Since I can't actually do that, I calmly decline.

There are many types of eye diseases, but as an optician, I cannot determine if there is one or if there is nothing wrong.
I don't have the equipment for that, and I'm not a doctor.

But for now, since glasses won't help, I recommend seeing an ophthalmologist.
Glasses are, after all, outside the eye. If there is a cause for poor vision inside the eye, doing things outside the eye won't make any difference.
(Though there are cases where that's not necessarily true.)

Besides, this is a business, so I could technically try to find a prescription that makes their 0.5 vision slightly better or worse, and then talk them into buying by saying,
“With this, you'll be able to see better (compared to now, at least)!”
It's physically possible to talk them into a sale like that. I just don't do it for moral reasons.

In other words, when an optician recommends seeing an eye doctor, it means they are putting the customer's well-being above making a sale.
And it means I want them to go as soon as possible.

Even so,
“Can't you do something if you increase the prescription!?”
“Just make the prescription two steps stronger!”
I feel like adding a left hook and blowing their eyeballs away along with those glasses (self-censored).

Since I can't do that either, I continue to persuade them calmly.
I don't even understand what “make the prescription two steps stronger” means. Does it mean double?

Please understand that when the seller stops a sale, it's a serious matter.
Sometimes it's just a precaution, but it's too late once the damage is irreversible.
Also, if I'm going to sell glasses, I want to sell ones that make the customer happy they bought them because they can actually see.

“So glasses won't work, huh...”
When those words come out, that's the final gong of the match. I burned out. I'm completely burned out.