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Health Conditions

Find information on various health conditions affecting people of all ages. This category covers causes, symptoms, diagnosis, and management options for physical illnesses and chronic diseases. Get insights to help you understand different health challenges and make informed decisions about your wellbeing.

Illustration of virus particles causing eye infection

Causes of Eye Infections

Eye Infections, Health Conditions /

Causes of Eye Infections The causes of eye infections depend on the type of organism involved. Eye infections can be caused by bacteria, viruses, fungi, or parasites—each requiring different treatment and carrying varying risks. Bacterial Infections Bacteria are among the most common causes of eye infections. They may result from: Staphylococcus aureus, commonly found on the skin Streptococcus pneumoniae, often linked to respiratory infections Pseudomonas aeruginosa, particularly in contact lens users Bacterial conjunctivitis causes red, sticky eyes with yellow or green discharge. More serious infections like bacterial keratitis or endophthalmitis may follow trauma, surgery, or contact lens misuse. Viral Infections Viruses such as: Adenoviruses – the most common cause of viral conjunctivitis (highly contagious) Herpes simplex virus (HSV) – can infect the cornea and lead to recurrent keratitis Varicella-zoster virus – causes shingles near the eye, which may affect the cornea or retina Viral infections are often harder to treat than bacterial ones, as antibiotics have no effect. Antiviral medications or supportive care are usually required. Fungal Infections Fungal eye infections are less common but can be severe: Fusarium or Aspergillus fungi may enter the eye after trauma with organic material Common in tropical or agricultural areas Often seen in people with compromised immunity or those using corticosteroid eye drops These infections can be sight-threatening and require antifungal eye drops or systemic treatment. Parasitic Infections One of the most serious parasitic infections is caused by: Acanthamoeba – found in water and soil, it can infect the cornea, especially in contact lens wearers who rinse lenses with tap water These infections are rare but extremely painful and difficult to treat. Risk Factors | Causes of Eye Infections Poor hygiene Use of contaminated eye makeup or lenses Eye injury or surgery Swimming in unclean water Chronic illness or immunosuppression Understanding the causes of eye infections helps doctors choose the correct treatment early and prevent vision loss. [Next: Symptoms of Eye Infections →]

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Woman touching her eye in discomfort

Symptoms of Eye Infections

Eye Infections, Health Conditions /

Symptoms of Eye Infections The symptoms of eye infections vary depending on the cause and part of the eye affected. Eye infections may range from mild irritation to severe pain and vision loss. Prompt recognition and treatment are crucial to prevent long-term complications. General Symptoms Most eye infections share a set of common signs: Redness of the eye or eyelid Eye discharge – clear, yellow, green, or thick mucus Itching or burning sensation Watery eyes Swelling of the eyelid or conjunctiva Gritty feeling, as if something is in the eye Sensitivity to light (photophobia) Blurred vision or reduced clarity These symptoms can affect one or both eyes, depending on the infection type and severity. Bacterial Infections Thick, yellow or green discharge Eyes stuck shut in the morning Swelling and tenderness around the eye Conjunctivitis caused by bacteria typically starts in one eye and spreads to the other. Viral Infections Watery discharge Redness and swelling, often with a scratchy or gritty sensation Associated cold or sore throat Viral conjunctivitis is highly contagious and often affects both eyes. Fungal Infections Persistent redness and eye pain Blurred vision that worsens over time History of trauma with plant matter or contact lens overuse These symptoms tend to develop slowly but can become severe without treatment. Parasitic Infections Severe pain, particularly in contact lens wearers Light sensitivity Rings or haze in the cornea (seen by a specialist) These signs require urgent ophthalmic care. When to Seek Help | Symptoms of Eye Infections Seek immediate medical attention if you notice: Sudden vision loss Intense eye pain Swelling around the eye that spreads to the face Inability to open the eye properly Persistent symptoms not improving in 48 hours Early recognition of symptoms of eye infections leads to more effective treatment and a lower risk of permanent damage. [Next: Diagnosis of Eye Infections→]

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Doctor examining a young woman's eyes

Diagnosis of Eye Infections

Eye Infections, Health Conditions /

Diagnosis of Eye Infections The diagnosis of eye infections typically begins with a clinical examination by an eye care professional. Because eye infections vary widely in severity and cause, it is important to correctly identify the underlying issue to provide effective treatment and prevent complications. Medical History and Symptom Review Doctors begin by asking detailed questions about: When the symptoms started What kind of discharge is present (watery, thick, coloured) Whether one or both eyes are affected Any recent illness, like a cold or sore throat Use of contact lenses or recent eye injury History of travel or exposure to contaminated water These questions help narrow down whether the infection is bacterial, viral, fungal, or parasitic. Eye Examination A visual inspection is the first step. Doctors use tools like: Slit lamp microscope – Allows a close-up view of the cornea, iris, and conjunctiva Ophthalmoscope – To assess the retina and optic nerve if infection may involve the inner eye Fluorescein dye test – Highlights damage to the cornea and identifies ulcers or abrasions Swelling, redness, corneal haze, or discharge help determine the likely cause and site of infection. Swabs and Cultures For persistent or severe cases, a sample of eye discharge may be collected: Bacterial cultures – Help determine the exact strain and antibiotic sensitivity Viral PCR testing – Detects specific viruses such as adenovirus or herpes Fungal or parasitic tests, where suspected, are more specialised and may take longer Swabs are especially useful if the infection doesn’t respond to first-line treatments or recurs frequently. Additional Investigations If the infection is severe or vision-threatening: Ultrasound of the eye may be done if visibility is limited by swelling or opacities Blood tests could be ordered if a systemic infection or immune deficiency is suspected Imaging such as CT or MRI may be used in rare cases when orbital cellulitis or internal spread is a concern Contact Lens Users If a contact lens-related infection is suspected, the lenses and storage case may also be tested to identify contamination. Importance of Timely Diagnosis of Eye Infections Early and accurate diagnosis ensures targeted treatment. Misdiagnosing a viral infection as bacterial (or vice versa) can lead to ineffective therapy, prolonged symptoms, or worse outcomes. The diagnosis of eye infections is usually straightforward but may require specialised tools or lab tests in more complex cases. Prompt evaluation protects vision and speeds recovery. [Next: Treatment of Eye Infections →]

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Woman applying eye drops for eye infection

Treatment of Eye Infections

Eye Infections, Health Conditions /

Treatment of Eye Infections The treatment of eye infections depends on the underlying cause—whether bacterial, viral, fungal, or parasitic. Doctors can often treat eye infections successfully with eye drops, ointments, or oral medications. However, some severe infections require urgent specialist care. Bacterial Infections Mild to moderate bacterial infections are treated with: Antibiotic eye drops, such as chloramphenicol or ofloxacin Antibiotic ointments, for cases involving the eyelid Warm compresses, to reduce swelling and ease discomfort In more serious infections like bacterial keratitis or endophthalmitis, treatment may include: Stronger antibiotic eye drops, applied frequently throughout the day Oral antibiotics, especially if the surrounding tissues are involved Hospital admission for intensive care in rare, vision-threatening cases Viral Infections Most viral infections, such as adenoviral conjunctivitis, do not require antibiotics. Treatment focuses on: Cold compresses Artificial tears Good hygiene practices, to prevent spread Doctors prescribe antiviral eye drops or oral antivirals like acyclovir to treat herpes simplex eye infections. Patients must take these promptly to prevent corneal scarring or recurrence. Fungal Infections Fungal infections of the eye, though rare, are serious: Treated with antifungal eye drops (e.g., natamycin) May require oral antifungal medication Severe cases sometimes need surgical intervention or corneal transplant These infections respond slowly and require prolonged treatment. Parasitic Infections Parasitic infections like Acanthamoeba keratitis are treated with: Antiseptic eye drops Pain relief Contact lens suspension during treatment These cases often need long-term care and may result in vision damage if not treated early. Supportive Care for All Types Avoid using contact lenses during active infection Do not share towels or cosmetics Dispose of old makeup and lens cases Regular handwashing, especially when applying eye medication When Surgery Is Needed | Treatment of Eye Infections In severe cases like abscess formation, corneal perforation, or endophthalmitis, doctors may need to perform surgical drainage or a vitrectomy. Early surgical consultation improves outcomes. The treatment of eye infections is most effective when tailored to the specific cause. Timely intervention prevents complications and restores eye health. [Next: Complications of Eye Infections →]

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Elderly man experiencing eye discomfort from infection complications

Complications of Eye Infections

Eye Infections, Health Conditions /

Complications of Eye Infections The complications of eye infections can range from mild irritation to serious, long-term vision problems. When eye infections are left untreated or not managed properly, they may lead to structural damage, scarring, or even blindness—especially in aggressive or deep-seated infections. Common Complications 1. Corneal Scarring Occurs when the infection damages the outer layer of the eye (the cornea) May cause permanent blurred vision or glare sensitivity Often follows severe keratitis or herpetic infections 2. Vision Loss Results from damage to the retina, optic nerve, or extensive corneal injury Can be partial or total, depending on severity More common in untreated or drug-resistant infections 3. Spread of Infection Bacteria or fungi may spread beyond the eye to the orbit (eye socket), causing orbital cellulitis In rare cases, the infection may enter the bloodstream or brain, leading to sepsis or meningitis Prompt treatment reduces this risk dramatically. 4. Chronic Dry Eye or Irritation Especially after viral conjunctivitis or prolonged use of antibiotic drops Can lead to long-term discomfort and visual fatigue 5. Recurrent Infections Common in herpes simplex virus, which lies dormant and can reactivate Poor lens hygiene may lead to repeated infections in contact lens users Surgical Complications In cases where surgery is needed: Corneal transplant risks include rejection, infection, and scarring Vitrectomy carries risks of bleeding or retinal detachment Careful follow-up is needed after any procedure Emotional and Lifestyle Impact Missed work or school days, due to discomfort and visual disturbance Embarrassment or anxiety, particularly if infection is visible or contagious Cost of treatment, especially in countries where specialist care is limited or not publicly funded Global Health Concerns | Complications of Eye Infections In low-resource settings, delayed treatment often leads to worse outcomes. Avoidable blindness from eye infections remains a global challenge, particularly in areas lacking basic healthcare, sanitation, or eye protection education. The complications of eye infections are preventable in most cases. Timely diagnosis, correct treatment, and good hygiene can preserve sight and prevent long-term problems. [Next: Complications of Eye Infections →]

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Close-up of eye showing visible tumour from eye cancer

Eye Cancer

Eye Cancer, Health Conditions /

Eye Cancer Eye cancer refers to any cancer that starts in or around the eye. Although rare, thiscancer can affect people of all ages and may develop in different parts of the eye, including the eyeball (globe), eyelid, orbit (eye socket), or conjunctiva. When detected early, many types of this cancer are treatable, but some can lead to vision loss or spread to other parts of the body if not addressed promptly. There are several types of this cancer. The most common in adults is intraocular melanoma, which begins in the pigmented cells of the eye. In children, the most prevalent form is retinoblastoma, a genetic cancer that affects the retina. Other forms include squamous cell carcinoma, lymphoma, and sebaceous gland carcinoma, each with varying levels of aggressiveness. Symptoms may be subtle and are sometimes mistaken for benign eye conditions. These include blurry vision, changes in eye colour, visible tumours, or flashes of light. In some cases, this cancer is discovered during routine eye examinations, emphasising the importance of regular vision screening. Eye Cancer While the exact cause of this cancer is not always known, genetic mutations, prolonged UV exposure, and family history may play a role. Research into early genetic markers and improved imaging techniques continues to advance detection and treatment. Globally, this cancer remains rare, but its impact on vision, appearance, and health can be profound. Recognising the signs early and seeking specialised care are essential for protecting sight and overall wellbeing. [Next: Causes of Eye Cancer →]

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Medical illustration showing cancer cells inside the eye

Causes of Eye Cancer

Eye Cancer, Health Conditions /

Causes of Eye Cancer The causes of eye cancer are not always fully understood, but a number of genetic, environmental, and medical risk factors have been identified. Eye cancer arises when abnormal cells grow uncontrollably in or around the eye, often due to mutations in DNA that affect cell division and repair. Genetic Mutations Certain forms of eye cancer, such as retinoblastoma, are linked to inherited genetic mutations. In these cases, children inherit a faulty gene (RB1) that predisposes them to tumour growth in the retina. While rare, this form is aggressive and usually diagnosed before the age of five. In ocular melanoma, mutations in genes such as GNAQ, GNA11, and BAP1 have been associated with increased cancer risk. These mutations can occur spontaneously or be influenced by environmental exposures. UV Radiation Exposure Just like skin cancer, ultraviolet (UV) radiation from the sun or tanning beds may contribute to eye cancer, particularly in fair-skinned individuals. Long-term exposure without eye protection may increase the risk of conjunctival melanoma and other surface cancers of the eye. Wearing sunglasses that block UV-A and UV-B rays is a simple yet effective way to reduce this risk. Eye Colour and Ethnicity People with lighter eye colours—such as blue or green—have a slightly higher risk of developing uveal melanoma. This may be due to reduced pigment protection within the eye. Incidence rates also vary by ethnic group, with white populations experiencing higher rates of intraocular cancers than those with darker skin tones. Pre-existing Conditions Some conditions may raise the risk of developing eye cancer: Oculodermal melanocytosis, which causes increased pigmentation in the eye and surrounding skin AIDS-related immunosuppression, which increases the risk of lymphoma in the eye Chronic inflammation, such as long-standing uveitis Environmental and Occupational Exposure There is ongoing research into the role of chemical exposure, particularly in industries involving welding, petroleum, or heavy metals. While evidence remains inconclusive, some studies suggest a possible link between these exposures and ocular tumour development. Global Patterns | Causes of Eye Cancer Eye cancer rates are highest in countries with established cancer registries, but many cases in low-resource settings may go undiagnosed or misclassified. Improved awareness and diagnostic access are helping to close this gap. Understanding the causes of eye cancer enables earlier identification of high-risk individuals and promotes preventative strategies across global populations. [Next: Symptoms of Eye Cancer →]

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Blurred vision with dark spots representing symptoms of eye cancer

Symptoms of Eye Cancer

Eye Cancer, Health Conditions /

Symptoms of Eye Cancer The symptoms of eye cancer can vary widely depending on the type, size, and location of the tumour. While some individuals notice obvious changes, others remain unaware until the cancer is discovered during a routine eye exam. Eye cancer may be silent in its early stages but become more noticeable as the tumour grows. Common Symptoms Blurry or distorted vision – One of the most frequent complaints A visible dark spot on the iris or white of the eye Partial or complete loss of vision, especially in one eye Eye pain or pressure, although not all cancers are painful Bulging of the eye (proptosis), particularly if the tumour is behind the eye Changes in eye movement, such as difficulty looking in certain directions Flashing lights or floating spots, similar to retinal detachment symptoms In young children, signs of retinoblastoma may include: A white pupil that shows up in photographs (leukocoria) Crossed or misaligned eyes (strabismus) Swelling or redness in the eye Poor vision or difficulty tracking movement Less Common Signs A persistent red or irritated eye Drooping eyelid A growing lump on or near the eye Changes in pupil shape or size Because these symptoms can mimic more common eye conditions like conjunctivitis, glaucoma, or cataracts, it’s essential to seek specialist evaluation if symptoms persist or worsen. When to See a Doctor | Symptoms of Eye Cancer Prompt referral to an ophthalmologist or ocular oncologist is recommended for: Unexplained vision loss Unusual eye appearance Persistent changes in eye shape, movement, or comfort Early detection is critical. Many tumours are treatable with high success rates if caught before they spread. Global Perspective In high-income countries, routine optometric screening often leads to early diagnosis. In lower-income regions, delayed detection is more common due to limited access to eye care and low awareness. Campaigns to educate the public and train local healthcare workers are helping bridge this gap. Recognising the symptoms of eye cancer early increases the chances of preserving vision, reducing treatment complexity, and improving survival outcomes worldwide. [Next: Diagnosis of Eye Cancer→]

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Doctors analysing eye cancer scan using digital imaging technology

Diagnosis of Eye Cancer

Eye Cancer, Health Conditions /

Diagnosis of Eye Cancer The diagnosis of eye cancer requires a thorough eye examination and a series of specialised tests to confirm the presence and type of tumour. Since eye cancer is relatively rare, early signs can be missed or misdiagnosed. Prompt referral to an eye specialist improves the chances of early detection and successful treatment. Clinical Evaluation An ophthalmologist begins by reviewing: Symptoms, such as vision changes, pain, or visible growths Medical history, including family history of eye disease or cancer Eye appearance, using a magnifying tool called a slit lamp to examine the front and back of the eye This detailed eye exam helps identify abnormalities in the retina, choroid, iris, and optic nerve. Imaging and Diagnostic Tests If cancer is suspected, further investigations are needed: 1. Ultrasound Scan (B-scan) Uses sound waves to create an image of the eye Detects the size, location, and consistency of a tumour Commonly used for intraocular tumours like melanoma 2. Ocular Coherence Tomography (OCT) Provides high-resolution cross-sectional images of the retina and surrounding structures Useful for tumours involving the retinal layers 3. Fluorescein Angiography A dye is injected into the bloodstream to highlight blood vessels in the retina Helps differentiate between benign and cancerous growths 4. MRI or CT Scan Used if the tumour may have extended beyond the eye or into surrounding tissues Also used to check for spread to lymph nodes or the brain 5. Biopsy In some cases, especially with surface tumours or when the diagnosis is unclear, a small tissue sample may be taken. However, biopsies inside the eye are rare due to the risk of vision loss or spreading cancer cells. Genetic Testing | Diagnosis of Eye Cancer For children with retinoblastoma, genetic testing is essential to confirm if the condition is inherited. This information guides treatment and screening for siblings or future children. Blood Tests and Systemic Evaluation If secondary cancer (metastasis) is suspected, blood tests and imaging of the liver, lungs, or brain may be necessary to locate the primary cancer or other sites of spread. Global Access In countries with well-equipped eye hospitals, diagnosis is efficient and often non-invasive. However, in lower-resource settings, lack of imaging tools and specialists can delay accurate diagnosis. Awareness campaigns and mobile eye clinics are beginning to improve this situation. The diagnosis of eye cancer must be prompt and precise to preserve vision and save lives. Early detection opens the door to effective treatment and better long-term outcomes. [Next: Treatment of Eye Cancer →]

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Laser therapy targeting eye for cancer treatment

Treatment of Eye Cancer

Eye Cancer, Health Conditions /

Treatment of Eye Cancer The treatment of eye cancer depends on the type, size, and location of the tumour, as well as whether the cancer has spread. Eye cancer can often be treated successfully, especially when detected early. The goal is to remove or shrink the tumour while preserving as much vision as possible. Main Treatment Options 1. Radiation Therapy Brachytherapy (plaque radiotherapy) – A small disc with radioactive seeds is temporarily attached to the eye to deliver targeted radiation External beam radiotherapy – Used for larger or more advanced tumours Radiation is effective for many intraocular melanomas and retinoblastomas. Side effects may include dry eye, cataracts, or mild vision loss. 2. Laser Therapy Transpupillary thermotherapy (TTT) uses infrared laser to destroy small tumours Often combined with radiation or chemotherapy 3. Chemotherapy Used more commonly in children with retinoblastoma: Doctors can deliver chemotherapy systemically (IV) or locally through intra-arterial or intravitreal routes Helps shrink tumours before applying local therapies In adults, chemotherapy is less common unless the cancer has spread. 4. Surgery Enucleation – Surgeons completely remove the eye when vision cannot be saved or the cancer is large Resection – In some cases, surgeons can remove the tumour surgically without removing the entire eye After enucleation, doctors can fit patients with a custom prosthetic eye for cosmetic purposes. 5. Immunotherapy and Targeted Therapy Doctors are exploring newer approaches, such as checkpoint inhibitors or drugs that target specific gene mutations (e.g., BAP1 in uveal melanoma), especially in advanced or metastatic cases. Supportive Therapies Vision rehabilitation for those with partial or full vision loss Psychological counselling to support emotional health Cosmetic surgery or prosthesis fitting, where needed Monitoring and Follow-up | Treatment of Eye Cancer Regular follow-up is critical to detect recurrence, manage side effects, and monitor the unaffected eye. Some patients need lifelong monitoring, especially those with inherited forms of cancer. Global Access and Challenges In high-income countries, most treatment options are available and coordinated by multi-disciplinary eye cancer teams. Additionally, in developing regions, lack of radiotherapy, paediatric oncology services, and prosthetic support may limit care. Telemedicine and cross-border treatment referrals are improving access in some regions. The treatment of eye cancer is advancing quickly. Furthermore, with personalised care and early action, many patients can survive and maintain good quality of life—even after losing sight in one eye. [Next: Complications of Eye Cancer →]

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