Red Eye: Causes, Treatment and When to See an Optometrist
A red eye is one of the most common reasons people seek eye care. While many cases are relatively minor, others can be painful, impact vision, and require urgent treatment. The difficulty is that many different eye conditions can cause redness, and they often look very similar without a detailed examination.
At Rose Optometry, we regularly assess patients with red eyes from Berry, Nowra and the surrounding Shoalhaven region. Our role is to accurately diagnose the cause, determine the urgency of the condition, and recommend the most appropriate treatment.
Not All Red Eyes Are the Same
Many people assume that a red eye is simply conjunctivitis, however redness can occur for many different reasons. Some conditions are primarily uncomfortable, while others can threaten vision if treatment is delayed.
Common causes of red eye include:
Allergic conjunctivitis
Viral conjunctivitis
Bacterial conjunctivitis
Contact lens-related complications
Corneal abrasions (scratches on the eye)
Corneal infections
Episcleritis
Uveitis
Because the treatment for each condition is different, obtaining an accurate diagnosis is important.
Common Causes of Red Eye
Dry Eye Disease
Dry eye is one of the most common causes of redness and irritation. Patients may experience:
Burning or stinging
A gritty sensation
Fluctuating vision
Excessive watering
Although dry eye can seem like a minor problem, it can significantly affect comfort and quality of life. Effective treatment often requires identifying the underlying cause and selecting the most appropriate management strategy.
Allergic Conjunctivitis
Eye allergies commonly cause redness, itching and watering. Symptoms often affect both eyes and may occur seasonally or throughout the year.
Many patients mistake allergies for an eye infection. An examination can help determine whether allergies are responsible and guide appropriate treatment.
Viral Conjunctivitis
Often referred to as "pink eye," viral conjunctivitis is highly contagious and commonly causes:
Redness
Watering
Irritation
Swollen eyelids
Light sensitivity
While many cases improve over time, some viral infections can affect the cornea and cause prolonged symptoms. An eye examination helps determine the severity of the condition and whether additional management is required.
Bacterial Conjunctivitis
Bacterial conjunctivitis may cause:
Redness
Sticky discharge
Crusting of the eyelids
Irritation
Although some cases can resolve naturally, others may require prescription medication. Accurate diagnosis helps ensure treatment is appropriate and effective.
Contact Lens-Related Red Eye
Redness in a contact lens wearer should never be ignored.
Contact lens wear can occasionally lead to serious corneal infections that may threaten vision if treatment is delayed. These conditions can progress rapidly and require prompt assessment.
If you wear contact lenses and develop a red eye, particularly if it is associated with pain, light sensitivity or blurred vision, you should remove your lenses immediately and seek professional eye care.
Corneal Abrasions and Eye Injuries
A scratch on the surface of the eye can cause significant discomfort and redness.
Symptoms may include:
Pain
Watering
Light sensitivity
Foreign body sensation
Redness
Prompt assessment helps determine the extent of the injury and whether treatment is required to reduce the risk of infection and support healing.
Less Common but More Serious Causes
Uveitis
Uveitis is inflammation inside the eye and may cause:
Eye pain
Light sensitivity
Redness
Blurred vision
Without appropriate treatment, uveitis can potentially lead to complications affecting vision.
Acute Angle Closure Glaucoma
Although uncommon, acute angle closure glaucoma is a serious eye emergency.
Symptoms may include:
Severe eye pain
Sudden blurred vision
Headache
Nausea
Redness
Seeing haloes around lights
Immediate assessment is required if these symptoms develop.
When Is a Red Eye Urgent?
You should seek urgent eye care if your red eye is associated with:
Pain
Light sensitivity
Reduced vision
Contact lens wear
Eye injury
A chemical splash
Rapid onset of symptoms
These symptoms can indicate potentially serious eye conditions that require prompt diagnosis and treatment.
Why an Accurate Diagnosis Matters
Many red eye conditions can appear very similar to patients. However, the treatment that is appropriate for one condition may be ineffective—or even inappropriate—for another.
For example:
Dry eye is managed differently to an eye infection.
Allergies require a different approach to viral conjunctivitis.
A serious corneal infection may initially resemble a relatively minor irritation.
This is why self-diagnosis can be difficult and why a professional examination is often recommended.
How Does an Optometrist Diagnose a Red Eye?
One of the most important instruments used during a red eye assessment is a slit lamp microscope.
A slit lamp allows an optometrist to examine the structures at the front of the eye under high magnification. This enables us to identify subtle signs of inflammation, infection, injury and other eye conditions that cannot be seen with the naked eye.
During the examination, we may assess:
The eyelids
The tear film
The conjunctiva
The cornea
Signs of inflammation
Signs of infection
Contact lens-related complications
This detailed examination helps determine the underlying cause and ensures treatment is targeted appropriately.
Can an Optometrist Treat a Red Eye?
Yes.
All optometrists at Rose Optometry are therapeutically endorsed, allowing us to prescribe medications when clinically appropriate.
Developing a red eye can be concerning, particularly when you're unsure of the cause. In many cases, an optometrist is the ideal first point of contact. We can accurately diagnose the underlying cause, provide evidence-based treatment recommendations, prescribe medications when clinically appropriate, and arrange referral to an ophthalmologist if specialist care is required. Our goal is to ensure you receive the right care at the right time and feel confident in understanding your condition and treatment options.
When Should You Book an Appointment?
If you develop a red eye, it is best not to guess the cause.
While some conditions are relatively minor, others require prompt treatment to protect vision and improve comfort. A comprehensive eye examination allows us to accurately diagnose the problem and recommend the most appropriate treatment.
Rose Optometry provides comprehensive red eye assessments for patients in Berry, Nowra and the surrounding Shoalhaven region.
Same-day and urgent appointments are often available. While online booking may be suitable for some presentations, we recommend calling the practice if you have developed a red eye. Our team is trained to triage these appointments and ensure you are seen as promptly as possible.
If you have developed a red eye, contact Rose Optometry to arrange an assessment and receive an accurate diagnosis.
Frequently Asked Questions About Red Eye
-
In many cases, an optometrist is an excellent first point of contact for a red eye. Optometrists have specialised equipment, including a slit lamp microscope, which allows detailed examination of the eye to determine the underlying cause of redness.
At Rose Optometry, all of our optometrists are therapeutically endorsed, allowing us to prescribe medications when clinically appropriate. If specialist care is required, we can also provide a referral to an ophthalmologist.
-
Yes. Dry eye disease is one of the most common causes of red eyes.
When the surface of the eye does not receive adequate lubrication, irritation and inflammation can occur, leading to redness, discomfort, fluctuating vision and excessive watering. Because several eye conditions can produce similar symptoms, a professional assessment is often helpful in determining the cause.
-
Some forms of conjunctivitis are contagious, while others are not.
Viral conjunctivitis is highly contagious and can spread easily through close contact. Bacterial conjunctivitis can also be contagious. Allergic conjunctivitis, however, is not contagious and occurs as a response to allergens such as pollen, dust or pet dander.
An examination can help determine which type of conjunctivitis may be present and guide the most appropriate management.
-
Yes. Therapeutically endorsed optometrists can prescribe a range of medications for eye conditions when clinically appropriate.
Following a comprehensive examination, your optometrist can recommend evidence-based treatment options and provide prescriptions where required.
-
You should seek urgent eye care if your red eye is associated with:
Pain
Light sensitivity
Reduced vision
Contact lens wear
Eye injury
Chemical exposure
Sudden or rapidly worsening symptoms
These symptoms can indicate potentially serious eye conditions that require prompt diagnosis and treatment.
-
Yes. Contact lenses can contribute to dryness, irritation, inflammation and, in some cases, serious eye infections.
If you develop a red eye while wearing contact lenses, remove the lenses immediately and arrange an eye examination as soon as possible, particularly if you experience pain, light sensitivity or changes in vision.
-
Some causes of red eye may improve without treatment, while others require medical management.
Because it is often difficult to determine the cause based on appearance alone, a professional examination is the safest way to ensure an accurate diagnosis and appropriate treatment plan.
-
Rose Optometry offers same-day and urgent appointments where possible.
If you develop a red eye, we recommend calling the practice rather than booking online. Our team is trained to triage red eye presentations and can help ensure you are booked into the most appropriate appointment as quickly as possible.
