More Than a Check on Your Glasses

Many of us treat an eye test as something to book only when the letters on a page start to blur or our reading glasses stop doing the job. In reality, a sight test is a proper health check for your eyes — and quite often a window into the rest of your body. For older adults, keeping up with regular appointments is one of the simplest and most valuable things you can do for your long-term health.

The good news is that it takes around 20 to 30 minutes, it is usually free on the NHS once you reach 60, and it can pick up problems long before you notice anything yourself. Sight loss in later life is not simply an unavoidable part of ageing, and much of it can be slowed, treated or managed when it is caught early.

What Happens at an Eye Test

Your appointment is with an optometrist, a qualified clinician who examines the health of your eyes as well as your vision. A thorough test typically includes:

• A conversation about your general health, medicines, family history and any changes you have noticed
• A vision check and refraction to measure whether your prescription needs updating
• A test of the pressure inside your eye, using a small puff of air or a gentle contact device
• Examination of the front of the eye with a slit lamp, checking the cornea, iris and lens
• Drops to widen your pupils so the retina, macula and optic nerve can be examined properly
• A visual field test to check your peripheral (side) vision, particularly if glaucoma is suspected
• Photographs or a scan of the back of the eye, which can be compared year on year

Dilating drops can leave your vision blurry and your eyes light-sensitive for a few hours, so it is wise to avoid driving straight afterwards and to bring sunglasses.

What Your Eyes Can Reveal About Your Wider Health

The retina is the only place in the body where blood vessels and nerves can be seen directly. That makes an eye test a rare opportunity to spot changes that may reflect conditions elsewhere, sometimes before symptoms appear:

• Glaucoma — often silent in its early stages, but damage to the optic nerve can be detected and treatment started
• Age-related macular degeneration — changes in the macula that affect central vision
• Cataracts — a clouding of the lens that is common with age and can be treated
• Diabetic retinopathy — bleeding or swelling in the retina linked to diabetes
• High blood pressure and high cholesterol — narrowed, kinked or leaking blood vessels can be an early clue
• Diabetes — occasionally the first sign is found during a routine sight test
• Thyroid and autoimmune conditions — which may cause bulging, dry or inflamed eyes
• Raised pressure inside the skull — seen as swelling of the optic nerve head, which needs urgent attention

An optometrist cannot diagnose most of these conditions, but they can flag them and write to your GP so that further tests can be arranged.

How Often Should You Have a Test?

Every two years is the usual recommendation for most adults. Many optometrists suggest yearly tests once you are over 60, or more often if you have diabetes, glaucoma, a family history of eye disease, or you are taking medicines that can affect the eyes.

In the UK, NHS sight tests are free if you are aged 60 or over, if you have been diagnosed with diabetes or glaucoma, if you are over 40 with a close relative who has glaucoma, or if you receive certain benefits. You may also qualify for a voucher towards the cost of glasses. If getting to a high street practice is difficult because of mobility or health problems, ask about a home visit — domiciliary eye care is available in many areas for people who are housebound.

Getting the Most From Your Appointment

• Bring a list of your medicines, including eye drops, and your current glasses
• Arrange transport or ask someone to come with you if your pupils will be dilated
• Write down any symptoms in advance: floaters, flashes, distortion, double vision, eye pain or redness
• Ask what was found, when you should return, and what changes would mean you should seek help sooner

Some symptoms should never wait for a routine appointment. Sudden flashes or a shower of floaters, a curtain or shadow across your vision, a sudden loss of sight or new distortion of straight lines all need same-day advice from an optometrist, GP or urgent care service.

Everyday Habits That Protect Your Sight

• Stopping smoking is the single biggest change you can make — it raises the risk of macular degeneration and cataracts
• Wear sunglasses with proper UV protection, even on cloudy days
• Eat plenty of leafy green vegetables, oily fish and colourful fruit and vegetables
• Keep blood pressure, blood sugar and cholesterol under control, and take prescribed medicines as directed
• Improve lighting at home and keep prescriptions up to date to reduce the risk of falls
• Give screens a break with the 20-20-20 rule: every 20 minutes, look 20 feet away for 20 seconds

If it has been a while since your last test, or you cannot remember when it was, putting an appointment in the diary this week is a small act of self-care with a big payoff. Your eyesight is precious, and protecting it is one of the best investments you can make in your independence, confidence and quality of life.