If you're past 60, the center of your sight has done a lot of work for you. It read every road sign you ever passed. Each face you found in a crowd landed there first. And it's reading this line right now.

But that small patch at the back of the eye wears with age. Doctors call the wear macular degeneration. When they spot the first signs, the advice is often short. Quit smoking if you smoke. Eat well. Come back next year.

You see, there's one more thing worth knowing about. It's an eye remedy so old the Romans cut its name into stone. And today it sits in the smallest box in the spice aisle...

Let me explain.

Sometime in the early 1800s, a small carved stone turned up near Tranent, a village east of Edinburgh. In 1851, a Scottish doctor named James Young Simpson wrote it up for a medical journal. You may know his name. A few years before, he had put patients to sleep with chloroform. He also loved old relics.

The stone had belonged to a Roman eye doctor. Doctors like him mixed salves for sore eyes and shaped them into small sticks. While each stick was still soft, they pressed a stamp into it. The stamp named the maker, the mix and the trouble it was for.

One side of this stamp named Lucius Valerius Latinus and his mild saffron salve for eye troubles. Saffron. The red threads from the heart of a purple crocus.

Latinus wasn't alone. About 300 of these stamps have turned up across the old Roman world, and saffron salves show up on a number of them. A broken one dug up in Dorchester, England, in 1937 seems to say its saffron salve was for clear eyes...

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But the Romans only put saffron on the eye. They had no way to check what it did.

The first proper test came in 2010, from Rome itself. Benedetto Falsini and his team at the Catholic University of the Sacred Heart worked with 25 people who had early wear at the center of the eye. Each one took a 20-milligram saffron capsule a day for three months, and dummy capsules for another three. Nobody knew which came first.

Then the team ran a flicker test. A light pulsed at the center of the eye about 41 times a second. Fine sensors read the tiny electric answer the cells sent back.

After saffron, that answer grew by about three-quarters, on average. The cells also picked up a fainter flicker than before. On the dummy capsules, nothing moved.

So why would a spice reach the back of your eye?

Here's the thing. The center of your sight is a thin patch, about a fifth of an inch wide, packed with cells that catch light. Light hits them every waking hour. When stress runs too long, those cells have a kind of self-destruct switch. In macular wear, more of them seem to flip it.

A lab at the University of L'Aquila, in Italy, tested this in rats. Silvia Bisti and Rita Maccarone fed one group saffron. Then they left the rats under bright light for a full day, enough to kill these cells. The saffron rats kept their cells, and those cells still answered light.

Rats fed a better-known plant pigment kept the cells' shape. But the electric answer was gone.

The team's best guess? Saffron helps stressed cells keep from flipping that switch. Of course, rats aren't people. Treat it as a clue to the "how," not the answer.

The biggest test so far: A team at the University of Sydney's Save Sight Institute gave 100 adults over 50, all with early or middle-stage macular wear, 20 mg of saffron a day for three months and dummy capsules for three. On saffron, they read a bit more of the eye chart, and the center of the eye answered light a little faster. That held for people already taking eye vitamins, too.

A bit more of the chart sounds nice. So how much more? Less than one letter, on average. That's a sliver.

Later, the Sydney team kept 93 of those people on saffron for a full year. The cells' electric answer held up. But chart scores slipped about a letter and a half. The team said cataracts, which also cloud sight with age, may explain it.

Three more things to weigh. Every trial used pills, not threads stirred into rice. All of the people in them already had macular wear. I couldn't find a single study that tested whether saffron keeps healthy eyes from wearing in the first place. And two of the Italian lab scientists later filed a patent, with an Italian company, on a saffron blend for eye disease.

Here's what I believe. Saffron is a small bet with a long history. It won't fix a worn eye. But the daily dose costs pocket change, and it tastes good.

The trials used 20 milligrams a day. A gram of saffron holds roughly 400 to 500 threads. So your daily dose is about 8 to 10 threads.

It takes about 150 flowers to make that gram. That means a day's pinch is roughly three flowers' worth. Each flower is picked by hand, and the crocus blooms right about now, in October and November.

An old way of reading food by its color fits here, too. Gold and yellow stand for clarity. Saffron leaves that gold in every pot it touches.

Ground saffron is easy to cut with cheaper yellow spices. Whole threads are harder to fake. Look for deep red threads with a slightly flared tip, and a gram count on the label so you can do the math.

Crush a pinch between your fingers and let it sit in two spoons of warm water for 15 minutes. The color and the good stuff come out in water. Then pour it all into rice, eggs, soup or a pot of beans.

Kitchen amounts are safe for most people. Very large doses, several grams at once, can make you sick. Eight to ten threads a day matches what the trials used, and there's no reason to go past it.

Lucius Valerius Latinus never ran a flicker test. He had no sensors and no dummy pills. What he had was a flower, a mortar and a hunch worth carving into stone.

More than 1,700 years later, that hunch has held up in a small, honest way. Not as a cure. As a pinch of gold that may help the cells doing your seeing.

Pick up a gram of threads this week. Start with tomorrow's breakfast eggs.