Corneal Ulcers: Warning Signs, Causes and Urgent Treatment
- Corneal Ulcers: Warning Signs, Causes and Urgent Treatment
- Infectious Corneal Ulcers
- 1. Bacterial Ulcers
- 2. Viral Ulcers
- 3. Fungal Ulcers
- 4. Parasitic Ulcers
- Non-infectious/ Inflammatory Corneal Ulcers
- 1. Autoimmune-Related Ulcers
- 2. Refractory Corneal Ulcers
- Inflammatory Vs Infectious Corneal Ulcers
- Symptoms of Corneal Ulcers
- Corneal Ulcers Differentiation with their Clinical Observations
- Urgent professional diagnosis of a suspected corneal ulcer
- Treatment Requires Urgent Ophthalmic Care
- Professional Assessment and Severity
- Potential Complications of Corneal Ulcers
- Where to Seek Help
- Frequently Asked Questions
- What is a corneal ulcer and what can cause one?
- What are the warning signs of a corneal ulcer?
- Is a corneal ulcer a medical emergency?
- What complications can an untreated corneal ulcer cause?
- Turn this information into a personal eye-care plan
Last updated: September 2026
In Kathmandu and worried about your eyes?
Book an eye exam (NPR 400 ≈ US$3) with our English-speaking optometrists in Lazimpat, Boudha or Makalbari — exams by appointment; optical shops open daily 8 AM – 8:30 PM. Card & cash accepted.
A corneal ulcer is an open sore of the cornea that may result from infection, injury, severe surface disease or other conditions. Contact-lens wear, contaminated water exposure, agricultural injury and immune-related disease are among possible risk factors.
Symptoms and risk factors overlap with other eye conditions, so a corneal ulcer cannot be confirmed safely at home.
Corneal ulcers are responsible for tissue excavation, infiltration, and necrosis, which can be hazardous if left untreated. By the end of the blog, you understand the causes, symptoms, clinical features, and treatment options in Nepal.
Infectious Corneal Ulcers
1. Bacterial Ulcers
Bacteria corneal ulcers occur when bacterial pathogens completely invade and disrupt corneal layers. It is a critical ocular emergency (epithelial erosion) caused by common bacterial pathogens like:
| Bacterial Pathogens | Key Characteristics |
|---|---|
| Staphylococcus aureus | Deep central stromal ulcer |
| Streptococcus viridans | saucer-shaped defect |
| Pseudomonas aeruginosa | central ulcer and liquefactive necrosis |
| Escherichia coli | A rare but serious ocular infection that originates from the gastrointestinal tract |
There are four distinct pathological stages progressive infiltration, active ulceration, regression, and cicatrization which doctors thoroughly analyze.
This condition is caused by progressive tissue destruction when bacteria successfully disrupt the epithelial barrier. And that’s possible with entry points like trauma, contact lens use, and ocular surface compromise.
Did you know Herpes simplex virus (HSV) can lead to infectious corneal blindness? This can happen if you are infected and triggered by stimulants like stress, or sunlight exposure. It can be your weak immune response failing to fight against HSV, that causes unilateral vision loss.
3. Fungal Ulcers
Fungal keratitis is a common cause of corneal ulcers in developing nations like Ghana, and Bangladesh, and sadly it is 17% in Nepal. Agricultural workers are at greater risk as this can occur following ocular trauma from vegetable matter. Some of the key characteristics include,
- More common in warm, humid environments
- Typically caused by trauma involving plant material
- Common fungi include Aspergillus, Fusarium, and Candida albicans
4. Parasitic Ulcers
Those who wear contact lenses regularly are at increased risk of parasitic ulcers. It is not suggested to wear contact lenses when you have some wounds or scars in your eyes. These atypical wounds are at risk of being invaded by pathogens protozoa, helminths, and arthropods.
Acanthamoeba keratitis is one of the common parasitic ulcers observed in Nepal. This eye disease can progress as it is often associated with contaminated water exposure
Non-infectious/ Inflammatory Corneal Ulcers
Associated with conditions like:
| Conditions associated with Corneal Ulcer | Ocular manifestations |
|---|---|
| Rheumatoid arthritis | Corneal melting and systemic vasculitis |
| Wegener's granulomatosis | mild conjunctivitis and episcleritis at first, but can progress to keratitis, scleritis, uveitis, and retinal vasculitis |
| Peripheral ulcerative keratitis (PUK) | peripheral corneal thinning |
| Systemic lupus erythematosus | Keratoconjunctivitis sicca and sometimes permanent blindness |
2. Refractory Corneal Ulcers
- Heal poorly and tend to recur
- Often seen in diabetic patients
- Caused by basement membrane defects
Inflammatory Vs Infectious Corneal Ulcers
| Characteristics | Inflammatory Corneal Ulcers | Infectious Corneal Ulcers |
|---|---|---|
| Causes | Autoimmune processes | Caused by bacteria, viruses, fungi, and protozoa |
| Onset | Gradual progression | Rapid progression |
| Pain | Moderate | Intense |
| Inflammatory response | Less acute inflammatory response | More aggressive inflammatory response |
| Borders | Often undermined | Well-defined |
| Treatment | Immunosuppressants | Targeted antimicrobial |
| Pathological Mechanism | Genetic predisposition and T-lymphocyte dysfunction | Release toxins and lytic enzymes causing tissue damage |
Symptoms of Corneal Ulcers
- Severe eye pain
- Redness of the eye
- Gritty (foreign sensation) feeling in the eye
- Excessive tearing
- Blurry or hazy vision
- Sensitivity to bright light (photophobia)
- Swollen eyelids
- Pus or thick eye discharge
- White or grayish spot on the cornea
- Inflammation around the eye
- Decreased visual acuity
- Focal white corneal opacity
Corneal Ulcers Differentiation with their Clinical Observations
| Bacterial Corneal Ulcers | Fungal Corneal Ulcers | Viral Corneal Ulcers | Acanthamoeba Corneal Ulcers | Autoimmune Corneal Ulcers |
|---|---|---|---|---|
| Rapid onset of pain | More indolent (slower) course | Dendritic (branching) lesion pattern | Intense pain disproportionate to physical findings | Ocular irritation, with intense and persistent pain |
| Grayish white infiltrates with distinct borders | Gray-white feathery lesions with irregular margins | Geographical defects | Ring-shaped perineural infiltrates | Larger than marginal keratitis |
| Stromal inflammation and edema | Dry, raised appearance | Sub-epithelial keratitis | Radial keratoneuritis | Crescentic shape |
| Conjunctival injection | Less impressive conjunctival injection | Stromal haze | Dendritic-like lesions | Local conjunctival injection |
| Gram-positive cocci cause localized round/oval ulceration | Satellite lesions possible | Reduced corneal sensation | Diffuse punctate epithelial lesions | Close to limbus |
| Gram-negative bacteria create a rapid, destructive inflammatory course | Superficial white-raised colonies with defined borders | Corneal thinning and potential vascularization | Severe photophobia | Associated with systemic autoimmune symptoms |
Urgent professional diagnosis of a suspected corneal ulcer
A suspected corneal ulcer is an eye emergency, particularly in a contact-lens wearer or when pain, light sensitivity, discharge or reduced vision is present. Arrange same-day urgent ophthalmic assessment rather than attempting home testing or waiting for a routine optical appointment.
Diagnosis may require slit-lamp examination, fluorescein assessment and, in selected cases, professionally collected samples for laboratory testing. These procedures must be performed by appropriately trained clinicians.
Treatment Requires Urgent Ophthalmic Care
Treatment depends on the suspected cause, ulcer size, depth, location, vision, contact-lens history and examination findings. Prescription antimicrobial or anti-inflammatory treatment must be selected and monitored by an appropriately trained clinician. Do not use leftover antibiotics, steroid drops, contact lenses or home remedies, and do not delay urgent assessment.
Professional Assessment and Severity
Severity is assessed through slit-lamp examination and fluorescein staining, with professionally collected samples or imaging when clinically indicated. A suspected deep ulcer, thinning, leakage or perforation needs immediate ophthalmic management.
Potential Complications of Corneal Ulcers
Corneal ulcers can be vision-threatening and cause severe other vision-related complications like,
- Corneal scarring
- Corneal perforation
- Glaucoma
- Cataract formation
- Anterior and posterior synechiae
- Risk of complete eye loss
- Irregular astigmatism
- Displacement of iris
- Tissue necrosis
Corneal ulcers while complicated in their timely diagnosis and treatment help ease symptoms. However, it cannot be guaranteed that they will continue to recover or continue to have morbidity and long-term ocular complications.
This article is educational and does not provide a treatment plan. Pain, light sensitivity, discharge, a white corneal spot or reduced vision requires same-day urgent ophthalmic assessment.
Where to Seek Help
For suspected corneal ulcer, go to an ophthalmic emergency service or hospital the same day. Do not wait for a routine optical appointment, WhatsApp reply or online enquiry.
Frequently Asked Questions
What is a corneal ulcer and what can cause one?
A corneal ulcer is an open sore on the cornea that can result from infection (bacterial, viral, fungal or parasitic), injury, contact lens wear, contaminated water exposure, agricultural trauma or immune-related disease.
What are the warning signs of a corneal ulcer?
Symptoms can include severe eye pain, redness, a gritty or foreign-body sensation, excessive tearing, blurry or hazy vision, light sensitivity, swollen eyelids, discharge, and a visible white or greyish spot on the cornea.
Is a corneal ulcer a medical emergency?
Yes. A suspected corneal ulcer should be treated as an eye emergency, particularly for contact lens wearers or when pain, light sensitivity, discharge or reduced vision is present. Same-day urgent ophthalmic assessment is recommended rather than waiting for a routine appointment.
What complications can an untreated corneal ulcer cause?
Potential complications include corneal scarring, perforation, glaucoma, cataract formation, irregular astigmatism and, in severe cases, loss of the eye, which is why urgent professional evaluation matters.
In Kathmandu and worried about your eyes?
Book an eye exam (NPR 400 ≈ US$3) with our English-speaking optometrists in Lazimpat, Boudha or Makalbari — exams by appointment; optical shops open daily 8 AM – 8:30 PM. Card & cash accepted.
Turn this information into a personal eye-care plan
If this topic relates to your symptoms or vision, book an eye assessment at Vision Concern. Share your main concern when booking so the team can confirm the appropriate appointment or referral.
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Yes. Many visitors, particularly from Bangladesh and West Bengal (Kolkata), come to Nepal for cataract, retina, or other eye surgery at a hospital and also want new glasses, a general eye exam, or contact lenses at the same time, before or after their procedure. Vision Concern is an optical and eye-examination clinic, not a surgical hospital, so we work alongside hospitals such as Tilganga: we are happy to see you for glasses, contact lenses, or a routine check-up either side of your surgical treatment elsewhere.
No conversion is needed. Eyeglass prescriptions from Germany, France, the UK, the USA, China, Russia, and almost every other country use the same international format, SPH (sphere), CYL (cylinder), and AXIS, measured in diopters. Our opticians read this directly, so you can bring your prescription paper, a photo of it on your phone, or simply your current glasses, and we will use the same values. If your prescription is more than a year or two old, we recommend a quick, free re-check before we make your new pair.
Yes. Above roughly 3,000 metres, UV exposure increases sharply because of the thinner atmosphere and reflection off snow, and ordinary sunglasses (category 2-3) do not block enough UV to prevent snow blindness (photokeratitis). We recommend glacier glasses or category-4 sunglasses with side shields, and can fit these with your own prescription if needed. Vision Concern offers ZEISS polarized, UV400-certified sunglasses with prescription lenses, which we can prepare before you set off on your trek.