The subtle eye changes that could actually signal a serious health issue

So many of us go through life adjusting to minor eye irritations and sight changes, but rarely treating eye care as something to be proactive about. Yet, according to Dr Tanya Trinh, an ophthalmologist at Sydney Eye Hospital, our eyes serve as direct indicators of systemic body health.

“People say eyes are the windows to the soul, but I always like to tell patients that they’re really windows into your general eye health, and there are very few diseases in the body that don’t have some sort of ocular correlation,” Dr Trinh, speaking on behalf of TAIK Health, told nine.com.au.

From predicting cardiovascular events to catching early warning signs of stroke, diabetes, dementia, and autoimmune conditions, a simple visit to the optometrist reveals far more than a simple glasses prescription, she added.

The link between vision, hearing, and dementia

Beyond vascular health, routine eye care plays a crucial role in cognitive health as we age. Just as addressing hearing loss is vital for brain stimulation, social engagement, and dementia prevention, there is a powerful association between cataracts and the onset or progression of vascular dementia and Alzheimer's disease.

“Research shows individuals who undergo cataract surgery experience a lower incidence or slower progression of dementia,” she said.

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“Sight and hearing are two of the senses we take for granted, and we think a lot of it’s just down to old age and it’s normal that it dulls down,” Dr Trinh notes, emphasising the medical community no longer advises leaving cataracts untreated indefinitely.

Beyond cognitive protection, addressing cataracts reduces fall risks, decreases at-fault driving accidents, and prevents fall-related brain bleeds, prompting Dr Trinh to recommend older adults bundle their audiology and optometry checkups together.

The modern dry eye epidemic and autoimmune warning signs

“Dry eye has evolved into a widespread health concern, largely driven by modern screen consumption,” Dr Trinh said.

“Dryness is something that’s going to affect everyone because we have so much screen time. When we’re concentrating on a screen or a phone, even just watching a movie, we tend to blink about 50 to 70 per cent less. Our eyelids aren’t just wipers away of debris, they’re also redistributors of the tear film, so dry eyes is a massive epidemic.”

But sometimes, eye dryness can signal autoimmune diseases such as rheumatoid arthritis, with young females “disproportionately affected” by these conditions.

“Then when you add in things like perimenopause and estrogen drop ... it is such a complex area, and the most frustrating thing for the clinician and the patient is that it isn’t just the one eye drop that’s going to magically make everything better,” Dr Trinh said.

Instead, she urges further investigation into the causes of dry eyes which can be caused by something as simple as fatigue, or even sun damage.

Red flags that require immediate medical attention

While many changes occur gradually, several visual symptoms demand urgent medical evaluation.

Sudden, painless vision loss

“Even if vision loss lasts for only a few seconds before returning, it warrants an immediate check,” Dr Trinh explained.

She said this phenomenon often indicates a miniature stroke, caused when a piece of cholesterol breaks off a larger blood vessel lining and lodges in a smaller vessel in the eye.

“I would say to my patients, ‘You should count yourself lucky, that piece of cholesterol could have gone somewhere in your brain instead’,” she warned.

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New floaters and flashes of light

Dr Trinh also urges patients who experience “floaters” in their eyes to seek medical attention.

“Most floaters are going to be harmless. But the collagen that was once very firmly adherent to the inner lining of the eye, which is like wallpaper, pulls away, and it can cause a little tear in the wallpaper, which is called the retina,” she said.

“And that can cause a retinal detachment, which absolutely needs either laser or surgery to fix so that you don’t become irreversibly blind.

“So if you get floaters or flashes of light in the eye, we would say get to your optometrist quick-smart. They’ll put in some eye drops to dilate the eyes so they can have a really good check inside and make sure you’re not having a stroke, or you’re not having a retinal issue that could rapidly progress.”

For those experiencing diabetes, maintaining good eye health can be extra challenging.

“You can have great control of your diabetes, but the longer that you have diabetes, you’re always going to have that background level of inflammatory damage to your blood vessels.

“So it’s exceptionally important in these patients have their regular eye checks.“