Opening the Case

My GP had been gently and persistently nudging me to book an eye exam for a while. Specifically, the kind of thorough one I needed as a diabetic — not the standard “read the chart, change your prescription, off you go” appointment. The kind that takes the eyes apart properly.

I’d been putting it off. My last proper exam was November 2023, in Spain, just before I came back to Canada. Time, as it does, had quietly slipped away.

And then, about two weeks ago, I started getting headaches. Not the usual kind — pressure headaches, right at the front of my head, like something was pushing forward from behind my eyes. My right eye had started going blurry at intervals, then clearing again. The kind of symptom that’s just ambiguous enough to be easy to dismiss, and just specific enough to be impossible to actually ignore.

So I started Googling — not optometrists, but eye doctors. There’s a difference, and as a diabetic, I knew I couldn’t settle for a basic vision exam. My eyes have already been through enough.

A bit of context for the urgency. I had cataract surgery on my right eye on February 24, 2021. One week later, on the left. Before those two surgeries, I had been functionally blind for nearly a year — not because the cataracts were untreatable, but because I was in Spain during the worst of the COVID lockdown, and elective eye surgery simply wasn’t available. Almost a year of waiting in the dark, in the literal sense, before the country opened back up and I could finally book the procedures. After that experience, my eyes are not a thing I take chances with. Ever.

So I found Dr. Shannon Chiu at Optomeyes Eye Care, West Vancouver and booked the most thorough exam they offered, and walked into something I wasn’t quite expecting.

Put the kettle on. This one’s worth your time.

Six Machines and a Headset

My appointment opened with a series of imaging machines, each one taking a different kind of picture or measurement of my eyes. Imaging of the front of the eye. Imaging of the back. Pressures. The works.

And then, in what was a first for me, I was handed a virtual reality headset with eye-tracking technology that uses subtle moving images to measure how your eyes work together and coordinate with the brain. It’s called Neurolens. It tests for a thing called eye misalignment — when your two eyes don’t quite agree on where they’re looking, even by a tiny fraction of a degree. The brain has to work overtime to fuse those two slightly different images into one. And that constant low-grade effort? It can show up as eyestrain, headaches, neck pain, the sense of being unable to read for as long as you used to, that 4pm computer-fatigue you’ve been blaming on coffee timing.

I mentioned the pressure headaches I’d been having. The two weeks of right-eye blur. And suddenly, a few pieces of the puzzle started lining up.

The whole experience was a bit unsettling, actually — in the best way. Because what it made painfully clear is that your eyes aren’t just little cameras feeding pictures to your brain. They’re in constant negotiation with your nervous system. The trigeminal nerve, the largest of the cranial nerves, has fibres that run between your eyes and your face, your sinuses, the muscles of your jaw. When your eyes are working too hard, your brain feels it. When something’s off in the eye-brain conversation, your whole head can pay the price.

So when we talk about eye health, we’re not talking about something that lives quietly in your face minding its own business. We’re talking about a system that’s wired into how you think, how you sleep, how much energy you have at the end of the day, and how comfortably you exist in your own head.

The Glands You’ve Never Heard Of

Then came the part I genuinely didn’t see coming.

There are tiny glands tucked behind your eyelashes — around 25 to 35 in your upper lid, 20 to 25 in your lower — that produce the oil layer of your tears. The very thing that stops your tears from evaporating before they’ve done their job. They’re called meibomian glands. Healthy tears have three layers, and they need all three to work properly:

• A mucous layer at the bottom that helps the tear stick to your eye.
• A watery middle layer that hydrates and delivers nutrients.
• An oil layer on top that stops everything underneath from evaporating into thin air.

That oil layer is called meibum. The meibomian glands sit in a neat little row inside both your upper and lower eyelids, just behind your lash line. There’s a tiny opening for each one along the rim of your lid. Every time you blink, those glands release a microscopic amount of oil to coat the tear film.

Beautiful system, when it’s working.

The trouble is that these glands are vulnerable. They can get blocked. The oil they produce can become too thick to flow through the tiny ducts. The glands themselves can shrink and atrophy over time. To assess them, the imaging used is called meibography — the lower lid is gently held back, the eyelashes are eased out of the way, and an infrared camera takes a picture of the gland structure. You can literally look at a row of healthy glands. And you can look at one where the glands have started to thin and disappear.

And here’s the bit that made me sit up straighter:

“Once they’re gone, they don’t grow back”
— Dr. Shannon Chiu, Eye Doctor, Optomeyes Eye Care

You can absolutely slow the decline. You can keep what you have working better. But the regenerative window is narrow, and once it closes, you’re working with what’s left.

And Then, the Reveal

My right eye — the one that has always been a little redder, a little itchier, the troublesome one — was at the early stages of meibomian gland dysfunction. Or MGD, the leading cause of dry eye disease — accounting, it turns out, for over 85% of cases. Less oil being produced, or oil that wasn’t getting through the ducts properly. Suddenly, the years of always made sense. The blur. The intermittent grittiness. The slight inflammation I’d dismissed as allergies.

My right eye had been telling on itself for years. I just hadn’t known how to read what it was saying.

The Paradox of Watery Dry Eyes

Here’s a thing nobody warns you about: dry eyes often water more, not less.

It sounds wrong. It feels wrong. It is wrong, except it isn’t.

When the meibomian glands aren’t producing enough oil, your tears evaporate faster than they should. Your eye surface dries out unevenly. Your nervous system registers that as irritation — and your reflex tear glands, which are different from your everyday tear glands, kick in with a flood of watery tears.

But those reflex tears don’t have the proper layered structure. They sluice across the eye, drain through the corner, and you end up with the bizarre combination of an eye that feels dry but is also leaking down your cheek. You blink constantly. You rub. The screen feels harder to focus on. You start wondering whether you need a stronger reading prescription, or whether this is just what your forties, fifties, or sixties look like.

It’s not. It’s evaporative dry eye, and it’s the most common kind. And the meibomian glands are at the heart of it.

The Blood Sugar Clue

This is where the case gets particularly interesting for anyone whose body has been leaving metabolic clues.

Elevated blood sugar — the diagnosed kind, but also the kind that hasn’t yet earned a label — affects the eye in several quiet ways long before retinopathy becomes a topic of conversation:

• The tear film itself becomes less stable. Studies have shown that people with even mildly elevated glucose have measurably shorter tear break-up time — meaning the tear film starts evaporating sooner after each blink.
• The meibomian glands seem to be more vulnerable to dysfunction. Higher rates of meibomian gland dropout (where glands shrink or disappear on imaging) have been documented in people with metabolic dysregulation.
• Advanced glycation end products — known mercifully as AGEs — accumulate in eye tissues. AGEs are what happens when sugar molecules attach to proteins and stiffen them. The lens, the retina, even the tiny structures in the eyelid are all proteins that don’t appreciate being glycated. AGEs in the lens contribute to cataracts forming earlier than they would otherwise. AGEs in the retina contribute to vascular damage. AGEs in the tear film and surrounding tissue feed inflammation that damages the surface of the eyes and the meibomian glands, perpetuating a vicious cycle of dry eye disease.
• The cornea becomes less sensitive when blood sugar runs high. Counterintuitively, this can mean people with metabolic issues feel the dryness less than they should — which means the system can be breaking down quietly while the symptoms underwhelm.

I’ll be honest with you. Some of these clues had been sitting in my own case file long before all the dots got connected. Cataracts that developed earlier than they should have. Dry eyes I’d dismissed as allergies. Itchiness in one eye, persistently, for years. The eye, it turns out, is one of the most honest organs you’ve got. It just doesn’t always shout.

The Inflammation Thread

Through all of this — meibomian glands, tear film, brain-eye coordination, blood sugar — there’s a single thread running. It’s the same thread that runs through almost every Health Detective case file I write.

Inflammation.

Chronic low-grade inflammation alters the composition of the meibum itself, making it thicker and harder to flow. It increases oxidative stress in the lens. It contributes to the small-vessel changes that affect the retina. It’s the connective tissue between the metabolic story and the eye story.

And here’s the thing that should give us all a quiet bit of hope: inflammation is one of the most modifiable parts of this whole picture. The food on your plate, the oils in your kitchen, the rhythm of your day, the quality of your sleep, the load you’re carrying — every one of these is a lever you actually have your hands on.

My Eye Hygiene Routine — What I Was Already Doing, and What I’m Adding

Since the cataract surgeries, eye hygiene has been a non-negotiable part of my day. My Spanish surgeon was clear: lid cleaning before and after surgery, then continuing as an ongoing ritual. I’ve kept it ever since.

Here’s what the routine looked like coming into this appointment:

• Eyelid wipes in the evening — particularly after I’ve been out walking, whether on the trails or around the city. Pollution, dust and sand drift everywhere, and your lash line catches more of it than you’d ever expect. Living close to the ocean (or, in my Spain years, the Mediterranean) only makes that more true. The brand my Spanish surgeon recommended was Blephaclean, which gently cleans the lash line and lid margin. The lid margin is exactly where the meibomian gland openings sit, so keeping it clean matters more than most people realise.
• Hydrating eye drops, three times a day minimum — in Spain, this was Hyabak. In Canada, the equivalent I’ve been using is Thealoz Duo. Both are preservative-free, which matters if you’re using drops daily.

After this appointment, two new things have been added to the routine:

• A warming eye mask — the one I’ve been given is the OcuSci Dry Eye Compress. Used at least once a day, ideally more. The warmth helps the thickened meibum soften and flow more easily through the gland openings, supporting what the glands can still do.
• An antimicrobial cleansing mist for the lids — Eyethos. A few sprays on the closed lids gives a deeper cleanse than wipes alone, promoting optimal eyelid and eyelash hygiene while reducing skin redness and irritation around the eyes.

Here’s the small joy I’ve found in this. The warming eye mask is exactly the right amount of time for my morning and evening meditation. Eyes closed, warmth on the lids, a few minutes of stillness. A clinical recommendation has quietly become a ritual. I’ll take that trade every single time.

Nutritional Support — The Detective’s Toolkit

The hygiene piece is one part of the case. Nutrition is the other — the underground river running beneath all of this. Get the food side right and you’re supporting the whole system from the inside.

These suggestions are general educational information, not personal prescriptions. If you’ve got real symptoms, please see your optometrist or healthcare provider — preferably one with the imaging to look at your meibomian glands properly.

Omega 3s — specifically EPA and DHA

This is the headline act. Omega 3s reduce inflammation throughout the body, but they also directly affect the composition of your meibum. Studies have shown that supplementation with EPA and DHA (the marine forms — not plant-based ALA, which converts poorly) can support tear film stability and ease dry eye symptoms. Look for triglyceride-form fish oil from small wild fish (sardines, anchovies, mackerel), with at least 1000mg combined EPA/DHA per day for therapeutic support. Re-esterified triglyceride form absorbs better than ethyl esters.

Vitamin A — in its true forms

Vitamin A is essential for the surface health of the eye and the function of the mucin layer of the tear film. Beta-carotene is the precursor that many people don’t convert efficiently — particularly anyone with thyroid issues or compromised gut absorption. The truly bioavailable form is preformed vitamin A as retinyl palmitate, found naturally in liver, egg yolks, and grass-fed butter. If supplementing, mixed natural carotenoids alongside a small amount of preformed vitamin A is the most balanced approach.

Lutein and Zeaxanthin

These two carotenoids concentrate in the macula of the eye, where they act as a kind of internal sunglass — filtering blue light and quenching oxidative stress. Marigold-derived supplements are the best concentrated source. You’ll also find them in dark leafy greens (kale, spinach, collards), egg yolks (where they’re particularly bioavailable thanks to the fat content), and orange vegetables.

Vitamin C with Bioflavonoids

The aqueous humour of the eye contains some of the highest concentrations of vitamin C in the body. It supports collagen integrity, reduces oxidative stress, and works synergistically with vitamin E. Whole-food sources — bell peppers, citrus, kiwi, berries — bring along the bioflavonoids that help vitamin C do its work. If supplementing, look for a buffered form or one that includes acerola or rose hips.

Vitamin E as Mixed Tocopherols

Not just alpha-tocopherol on its own, which is what most cheap supplements offer. The full spectrum (alpha, beta, gamma, delta) gives you the antioxidant support the eye actually needs. Wheat germ oil, almonds, sunflower seeds, and avocados are good food sources.

Zinc — particularly Bisglycinate or Picolinate

Zinc is concentrated in the retina and is essential for vitamin A activation. Many people, particularly women in midlife, run quietly low. Pumpkin seeds, oysters, beef, and lamb are excellent food sources. If supplementing, zinc bisglycinate or zinc picolinate are gentle and well-absorbed.

B Vitamins — especially Methylcobalamin (B12) and P5P (active B6)

B vitamins support nerve function, including the corneal nerve fibres and the trigeminal pathways we talked about earlier. Methylcobalamin specifically has been studied for its support of dry eye and corneal health. If your B12 has been “fine” on standard tests but you’ve still got symptoms, ask about an active B12 (holotranscobalamin) test.

Alpha-Lipoic Acid

This one’s particularly interesting for the blood sugar angle. Alpha-lipoic acid is a powerful antioxidant that’s both water- and fat-soluble, meaning it crosses into the eye tissues effectively. It supports glucose metabolism, helps reduce AGE formation, and has been studied for diabetic eye complications.

Magnesium Glycinate

Often under-recognised in the eye-health conversation, magnesium supports blood sugar regulation, nervous system function, and the delicate vascular network feeding the retina. Most of us are running below where we should be.

Hydration — actual, electrolyte-supported hydration

Plain water alone isn’t always enough. Adding a pinch of unrefined sea salt, a squeeze of lemon, and the occasional electrolyte support helps cellular hydration reach the tissues that actually need it.

Red Flags — When This Becomes Urgent

Most dry eye symptoms can be supported with the toolkit above. But there are signals worth taking seriously:

• Sudden vision changes, especially blurring that doesn’t clear with blinking.
• Sharp eye pain, light sensitivity that’s new or severe, or the sensation of something in the eye that won’t resolve.
• Pressure headaches, persistent eye fatigue, or visual changes that come and go — anything that feels like more than ordinary tiredness deserves an exam.
• Vision loss — even partial, even brief, even in just one eye — is always urgent and warrants immediate evaluation.

If you’re managing diabetes or pre-diabetes, please don’t skip your annual dilated eye exam. The eye changes can develop quietly. The early ones are often the most treatable.

Closing the Case

Your eyes are not just little cameras. They’re a window — into your blood sugar, your inflammation, your nervous system, and the long quiet conversation your brain is having with the rest of you. The clues are all there. They’ve been there for a while, possibly. The gritty feeling, the watering, the afternoon fatigue, the eye that’s always been the troublesome one.

These aren’t things to grumble about and dismiss. They’re a case file waiting to be opened.

The good news, if you’re reading this and recognising yourself, is that the meibomian glands you have right now are still working with you. The inflammation is modifiable. The blood sugar story is one you can rewrite. The omega 3 ratio in your meibum responds to what you eat. Your vitamin A status responds to your meals. Your eye-brain coordination can be supported. None of this is fixed.

But it does require following the clues. And the first clue is just paying attention — to a feeling you’ve been ignoring, a symptom you’d written off, a slight change you’d assumed was just the cost of being in your forties or fifties.

As for me, my morning meditation now begins with a warm mask resting gently on my eyes. Two minutes of stillness, a small act of repair, before the day starts properly. After almost a year in the dark, I don’t take any of this for granted.

Your eyes have been telling on you for a while. The detective work is in finally listening.