The human eye works with the brain to turn light into the images we use for reading, driving, recognising faces and moving through the world. This guide explains the main parts of the eye, how vision works, common eye conditions and practical ways to look after your eyes. For detailed information about a specific condition, use the links throughout this page.
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Find an OptometristKey Takeaways
- The cornea and natural lens focus light, while the retina converts it into signals that travel through the optic nerve to the brain.
- Blurred or changing vision can have many causes. An eye examination is needed to identify the reason.
- Common conditions such as myopia, astigmatism, dry eye, cataracts, glaucoma and macular degeneration are covered in dedicated AMV guides.
- Screen breaks, suitable lighting, UV protection and regular eye care can support visual comfort and eye health.
- Australian Made Vision provides general eye-health information and a directory of independent optometry practices; individual practices provide clinical care.
Understanding the Anatomy and Function of the Human Eye
The eye is a light-sensitive organ that works closely with the brain. Light enters through the cornea, passes through the pupil and is focused by the natural lens. The retina at the back of the eye converts light into electrical signals, which travel through the optic nerve to the brain. The brain then interprets those signals as vision.
A healthy tear film also supports clear and comfortable vision. It coats the front surface of the eye and helps keep the cornea smooth. When the tear film is unstable, vision may fluctuate and the eyes can feel dry, gritty or irritated.
The Outer Eye: Protection and Light Entry
The cornea is the clear front surface of the eye and provides much of the eye’s focusing power. The sclera forms the tough white outer layer, while the conjunctiva is a thin membrane that covers part of the front of the eye and the inside of the eyelids.
The iris is the coloured part of the eye. It changes the size of the pupil to control how much light enters. In bright conditions, the pupil becomes smaller; in darker conditions, it becomes larger.
The Inner Eye: Focusing, Processing and Transmission
Behind the iris sits the crystalline lens. It changes shape to help the eye focus at different distances. Further back, the retina contains light-sensitive cells, and the macula provides the detailed central vision used for tasks such as reading and recognising faces. The optic nerve carries visual information from the retina to the brain.
Find Eye Care That Suits Your Needs
Search for an independent optometrist near you and find a local practice that suits your specific eye care needs.
Find an OptometristCommon Eye Conditions: When Vision Changes
Many eye conditions can affect focus, comfort or eye health. Because several conditions can cause similar symptoms, this section is only an overview. Use the dedicated guides below for more detail rather than relying on a symptom list to identify a condition.
Refractive Errors
Myopia, or short-sightedness, mainly affects distance vision. Read the AMV guide to myopia (short-sightedness) for symptoms, assessment, correction and myopia-management information.
Astigmatism can make vision look blurred or distorted at more than one distance. See the AMV astigmatism guide for causes, eye-test information and correction options.
Long-sightedness (hyperopia) and presbyopia can also affect near focus. Presbyopia is an age-related change in the eye’s focusing ability and commonly becomes noticeable in midlife. An eye examination can distinguish between refractive changes and other causes of blurred vision.
Dry Eye and Eye-Surface Comfort
Dry eye disease can cause grittiness, burning, watering, fluctuating blur and discomfort. Screen use, air conditioning, contact lenses and other factors may contribute, but persistent symptoms should not be self-diagnosed. Read about dry eye symptoms, causes and care
Age-Related and Chronic Eye Conditions
Cataracts gradually cloud the eye’s natural lens and can affect clarity, contrast and glare. Learn about cataract symptoms and assessment
Glaucoma can damage the optic nerve and may have few or no early symptoms. Read the AMV glaucoma guide for risk factors, assessment and urgent symptoms.
Age-related macular degeneration affects the macula and central vision. Read about macular degeneration in Australia for signs, assessment and treatment pathways.
Sudden Vision Changes Need Urgent Assessment
Sudden vision loss, a new shadow or curtain in the vision, new flashes of light, a sudden increase in floaters, or a marked sudden change in vision should not be treated as a routine prescription issue. Seek urgent medical assessment. For severe or sudden vision loss, go to the nearest emergency department or call triple zero (000) if an ambulance is needed.
How Glasses and Lenses Fit Into Vision Care
Spectacle lenses can correct refractive errors and may be designed for different visual tasks, prescriptions and preferences. The most suitable lens depends on the prescription, frame, fitting measurements, daily activities and budget. Lens origin alone does not determine whether a lens is suitable or clinically better for an individual.
For specific lens information, see AMV’s current guides to blue light glasses, anti-reflective coatings, high-index lenses and photochromic lenses.
Find Eye Care That Suits Your Needs
Search for an independent optometrist near you and find a local practice that suits your specific eye care needs.
Find an OptometristPractical Tips for Maintaining Healthy Eyes in a Digital Age
Take Regular Breaks From Close Work
Long periods of concentrated near work can leave the eyes feeling tired, dry or difficult to focus. A commonly used reminder is the 20-20-20 approach: every 20 minutes, look at something about 20 feet (6 metres) away for around 20 seconds. The exact timing is less important than regularly changing focus, blinking and taking breaks from sustained near work.
Set Up Your Screen and Lighting for Comfort
- Keep the screen at a comfortable viewing distance and height.
- Reduce strong reflections and glare where possible.
- Adjust screen brightness so it is comfortable in the surrounding room light.
- Blink regularly, especially during long periods of concentration.
- If symptoms continue, arrange an eye examination rather than relying on screen settings alone.
Protect Your Eyes From UV
For outdoor use, choose sunglasses that provide appropriate UV protection and comply with Australian requirements. Dark tint and polarisation are separate features: polarisation can reduce reflected glare, while UV protection relates to the filtering properties of the lens.
Eat for General Health, Not as a Substitute for Eye Care
A balanced diet that includes vegetables, fruit, whole grains, nuts, seeds and fish can support general health. Some nutrients are important for normal eye function, but food or supplements should not be presented as a treatment or guaranteed way to prevent an eye condition. People with an established eye disease should follow advice from their treating clinician.
When to Arrange an Eye Examination
Arrange an eye examination if vision is persistently blurred, your current prescription no longer feels clear or comfortable, you notice ongoing eye discomfort, or a child is having difficulty with distance or near vision. How often you need an eye test depends on age, symptoms, eye-health findings, medical history and the advice of your eye-care professional.
To compare participating independent practices, find an independent optometrist through the AMV directory. Services, fees, equipment and appointment availability vary between practices, so confirm details directly with the individual practice.
The Role of an Independent Optometrist
Independent optometry practices can differ in the services they offer, the suppliers they work with, the technology they use and the way appointments are structured. Independence does not automatically mean one practice is clinically better than another, so it is more useful to compare the individual practice, its services, the optometrist’s experience and whether the care model suits your needs.
Useful questions include what the eye examination may involve, which services are available at that location, how follow-up is handled, what lens options are offered and what fees may apply.
Find Eye Care That Suits Your Needs
Search for an independent optometrist near you and find a local practice that suits your specific eye care needs.
Find an OptometristFrequently Asked Questions
How often should I have an eye test in Australia?
There is no single interval that is right for everyone. The timing depends on age, symptoms, previous eye findings, medical conditions, family history and the advice of your optometrist or ophthalmologist. If you notice a new or persistent change in vision, arrange an assessment rather than waiting for a routine date.
What are the first signs of my vision changing?
Possible signs include persistent blur, squinting, difficulty reading or seeing road signs, needing to move closer to see detail, increased glare or a current prescription no longer feeling clear. These signs can have different causes, so an eye examination is needed to work out what is contributing.
Are Australian-made lenses automatically better than imported lenses?
No. Manufacturing origin alone does not prove that one lens is optically superior or more suitable for a particular person. Lens design, material, prescription accuracy, fitting measurements, coatings, quality control and the wearer’s needs all matter. If Australian-made products are important to you, ask the practice which products are made in Australia and what part of the manufacturing process occurs locally.
What is the difference between an optometrist and an optical dispenser?
An optometrist is a registered eye-care practitioner who examines eyes, measures vision and manages eye-health and vision concerns within their professional scope. An optical dispenser is trained to interpret prescriptions and help fit and supply spectacles and other optical products. The roles are different but often work together in an optometry practice.
Can digital eye strain permanently damage my eyes?
Digital eye strain usually refers to symptoms such as tired eyes, dryness, headaches or difficulty focusing during prolonged screen use. These symptoms can be uncomfortable, but they do not automatically mean the screen has physically damaged the eye. Persistent or worsening symptoms should be assessed because other vision or eye-health issues may be contributing.
How do I know if I have astigmatism or just tired eyes?
Symptoms alone cannot reliably distinguish astigmatism from eye strain or other causes of blur. Astigmatism is measured during an eye examination using refraction and other tests. If blur is persistent or changing, arrange an assessment rather than trying to identify the cause from symptoms.
Why do progressive lenses vary in price?
Progressive lens prices can vary because of differences in lens design, material, coatings, prescription complexity, fitting requirements, brand and the services included by the practice. Higher price does not automatically mean a lens will suit every wearer better, so compare the design, measurements, warranty or remake policy and aftercare.
Does Medicare cover eye tests for all Australians?
Medicare eligibility and claiming rules can depend on the service, the person’s circumstances and how often the benefit is available. Bulk billing is a practice decision and may not apply to every service. Check current Medicare information and confirm any fees or out-of-pocket costs with the individual practice before booking.