“I Recommended That Bottle For Twenty Years. Not Once Did Anybody Teach Me What Happened To It After The Patient Swallowed It.”
I was not lying to those patients and I was not lazy. I was answering the question I had been trained to answer, and it was the wrong question. Here is the right one.
I retired eighteen months ago, and I have spent a good part of that time thinking about a conversation I had several thousand times without ever once examining it.
It went like this. The examination is finished. The patient is putting their coat back on. And somewhere in the last ninety seconds, they ask the question they have actually been waiting the whole appointment to ask: is there anything I can take?
And I would say: there's some evidence for lutein. You could try an eye supplement.
I said that for twenty years. I believed it. It was, as far as it went, correct. And I never in my career asked the obvious next question, which is what happens to the thing after the patient swallows it.
I trained in the late nineteen-eighties and I spent 28 years on cataract and retina — a great deal of surgery, and rather more clinic than surgery. Somewhere over twenty thousand patients.
These are the things I saw week after week, for a quarter of a century:
- People in their sixties told, in these words, that it was “just your age”
- The same people back a year later, worse, having done everything they were asked
- Patients who had bought three different eye supplements and finished none of them
- A perfectly correct new prescription handed to somebody whose problem was not refractive
- The supplement conversation squeezed into the last ninety seconds of a seven-minute appointment, every time
I want to be fair to my own profession here, because the easy version of this article is a doctor being brave about other doctors and I have no appetite for it.
Nobody was being negligent. The advice to try lutein is good advice. The evidence behind it is real. The problem is narrower and stranger than negligence: we were recommending a molecule and nobody in the room — me included — had ever thought carefully about the journey it had to make.
Three People I Have Not Been Able To Stop Thinking About
You do not remember the interesting cases. Every retired clinician tells you that and every one of them is surprised by it. You remember the ordinary ones where you did everything correctly and it did not help.
He brought the bottles in. Not to complain — he brought them in a carrier bag because he genuinely thought he might be taking them wrong, and he wanted me to check. Four bottles. Two of them the same brand at different strengths.
I told him they were all fine and he was taking them correctly, which was true, and I watched him put them back in the bag. He said, on the way out, “so it's just me then.” I said something reassuring. I have thought about that sentence for six years.
She had stopped driving at night eighteen months earlier and had not mentioned it to anyone, including her husband, who had simply started doing the evening journeys. It came out sideways, while she was describing something else.
Her examination was unremarkable. Her prescription was very slightly out and we corrected it. That correction did nothing for the thing she had actually stopped doing, and I knew it would not while I was writing it.
Textbook cataract surgery, both eyes, and a good result on paper — his acuity was better than it had been in a decade. He came back at six weeks to tell me that headlights were still starring and the world still looked, in his words, washed out.
I had replaced his lenses. I had not touched what was behind them. He is the patient who eventually made me go and read properly, and everything after this point in the article comes from that.
Three people, one pattern, and I did not see it for most of my career: in every case the thing I could measure was fine and the thing they were living with was not.
What Mr Salvatore Made Me Go And Look Up
Let me be extremely clear about one thing before I go on, because this is the point at which an article like this usually goes wrong and does real harm.
Have the surgery when your surgeon tells you to have it. A cataract is the lens of your eye going cloudy, the operation is one of the safest and most transformative in all of medicine, and nothing on this page is a reason to put it off for a single week. If you take one thing from a retired cataract surgeon, take that.
But here is what I had never properly sat with. A cataract operation replaces the lens. It does not touch the retina behind it. And a good number of the complaints people bring back afterwards — glare, starring, washed-out colour, needing more light — were never coming from the lens in the first place. I was fixing the window and they were telling me about the room.
The Door At The Back Of Your Eye
There is a barrier between your bloodstream and the back of your eye, and it is one of the tightest in the human body — the same class of seal as the one around your brain. It is there on purpose. It keeps infection out of a tissue that cannot repair itself.
It also keeps almost everything else out.
So when you swallow a lutein capsule, this is the journey it takes. Down. Through the stomach, where it needs fat in the meal to be absorbed at all. What survives goes to the liver, which takes its cut and hands the rest to the bloodstream, which shares it out to every tissue that wants it — your fat, your skin, your liver again. And what is left, at the very end of that queue, arrives at a door that admits almost nothing.
This barrier is not a flaw and it is not a symptom of anything. It is one of the more impressive pieces of engineering in the human body. The retina is neural tissue that cannot regenerate, so it is sealed off in much the same way the brain is, and that seal is the reason most of us go a whole lifetime without a retinal infection.
The cost of it is that almost nothing else gets in either — including the carotenoids the macula is physically built out of, which have to be carried across by specific transport proteins, in limited quantities, at a rate that has very little to do with how much you swallowed.
The Only Time I Ever Watched Something Reach A Retina
There is a test we do called a fluorescein angiogram. You put a dye into a vein in the patient's arm, sit them at the camera, and wait.
About ten to twelve seconds later the retinal vessels light up, live, on the screen in front of you. The first time you see it as a trainee it is genuinely startling — this branching tree coming up out of nothing, arm to eye, in the time it takes to say a sentence.
I must have run several thousand of those and I never once thought the obvious thought, which a chemist would have had immediately.
That dye reaches the retina in twelve seconds because somebody designed a molecule to do exactly that. It is small, it is water-soluble, it is put directly into a vein, and every one of those properties was chosen. It is the exception, and the whole reason the test is useful is that it is the exception.
Nobody has ever designed lutein to do that. Lutein is a large, oily plant pigment that we eat, and we hand it to people in a capsule and then act surprised when the eye does not fill up with it. I watched the exception arrive several thousand times and never once asked what the rule was.
“I spent my career recommending a molecule and never once asked how it was supposed to get there.”
Dr. Martin Vance, MD, 28 years, retired
What I Would Tell Mr Aldridge Now
I would tell him the four bottles in his carrier bag were fine, which is what I told him then, and that it was not just him, which is what I failed to tell him.
And then I would tell him the thing I did not know at the time: that if you have given a swallowed formula an honest three months and cannot point to anything, the problem is unlikely to be the formula, and a stronger one is very unlikely to fix it. What changes the arithmetic is not using that route.
The thinnest skin on the human body is the skin of the eyelid. Something applied there starts a few millimetres from where it is needed rather than at the far end of a digestive system. The formula I would want on it is three things:
Luteora™
The two carotenoids the centre of your retina is physically built out of, and which your body cannot manufacture a single molecule of. Nothing controversial here and nothing new — this is the same pair that is in the bottle in your cupboard. The difference is not what it is. The difference is where it is put.
Veilpass™
This is the part a capsule has no equivalent of. Carotenoids are oily and the skin of the eyelid is the thinnest on the whole body, so the carrier is built to sit on that skin and stay there rather than bead up and run. The hyaluronic acid holds the film in place through a blink instead of letting it wick away in seconds.
Cyanthin™
Getting the pigment there is half a job if it is being oxidised the moment it lands. Bilberry and astaxanthin are the two the European work keeps returning to for glare recovery and for how fast an eye settles after a bright light, and vitamin E is the one that keeps the oil in the film from turning before it is used.
None of that is a treatment for a disease and I want no confusion on the point. If you have macular degeneration, glaucoma or diabetic eye disease, you are under the care of somebody and you should stay under it. Keep your appointments and keep your eye tests.
This is for the very large group of people in between — the ones whose examination is unremarkable, whose prescription is correct, and who have quietly stopped driving after dark.
The Ninety Seconds I Would Use Differently
If I could go back and have that end-of-appointment conversation again — the coat going on, the question they had been saving — I would not say anything braver or cleverer. I would just answer a better question.
Not what should I take. How is it supposed to get there.
I got asked the first one several thousand times. Nobody ever asked me the second, and I never volunteered it, because until a 76-year-old man came back six weeks after perfect surgery and told me the world still looked washed out, it had genuinely never occurred to me.
Have your eyes examined. Have the surgery if it is offered to you. Get the prescription right.
And then look after the part nobody replaces.