A corneal abrasion is a scratch or scrape on the cornea, the clear front surface of the eye. It involves damage to the corneal epithelium, the thin outer “skin” layer of the cornea. The term is commonly used in urgent eye care, emergency settings, and routine eye clinics. It describes a frequent cause of sudden eye pain, tearing, and light sensitivity.

A corneal ulcer is an open sore on the cornea, the clear front “window” of the eye. It usually reflects inflammation plus loss of surface tissue, often from infection or surface damage. The term is commonly used in ophthalmology and optometry to describe a potentially vision-threatening corneal problem. It is discussed in clinics, emergency eye care, and contact lens–related eye evaluations.

superior limbic keratoconjunctivitis is an inflammatory condition that affects the top (superior) part of the eye’s surface. It involves the conjunctiva (the thin membrane over the white of the eye) and the cornea (the clear front window of the eye). It commonly shows up as irritation and redness concentrated under the upper eyelid. The term is mainly used in eye clinics and in ophthalmology/optometry training to describe a specific pattern of ocular surface disease.

punctate epithelial erosions are tiny, dot-like areas of damage on the outermost layer of the cornea (the epithelium). They are usually seen during an eye exam using special dyes and a slit-lamp microscope. The term is commonly used in ophthalmology and optometry to describe a pattern of “surface breakdown” on the eye. They are a clinical finding, not a diagnosis by themselves.

filamentary keratitis is a condition where sticky strands (“filaments”) form on the surface of the cornea. These filaments can cause irritation because they tug on the corneal surface with blinking. It is most commonly discussed in dry eye and other ocular surface disorders. Clinicians use the term to describe a specific pattern seen on eye exam that helps guide evaluation and care.

Exposure keratopathy is corneal surface damage caused by the eye being too exposed to air. It happens when the eyelids do not close fully or the tear film does not protect the cornea well enough. It is commonly discussed in dry eye clinics, neuro-ophthalmology, eyelid (oculoplastics) care, and hospital/ICU eye protection.

neurotrophic keratopathy is a corneal disease caused by reduced or absent corneal nerve function. It can lead to poor corneal healing, surface breakdown, and ulceration. It is commonly discussed in eye clinics because it can look mild early on but become vision-threatening. It is diagnosed and managed by ophthalmologists and optometrists, often within cornea and ocular surface care.

VZV keratitis is corneal inflammation caused by varicella zoster virus (VZV). It is most often discussed in the setting of shingles affecting the eye area (herpes zoster ophthalmicus). It can involve the corneal surface, deeper corneal layers, or both. The term is commonly used in eye clinics to describe a specific cause of keratitis and guide evaluation and monitoring.

HSV keratitis is inflammation and infection of the cornea caused by herpes simplex virus (HSV). It is a common clinical diagnosis in eye clinics and emergency eye care settings. It can affect the clear front surface of the eye and sometimes deeper corneal layers. It matters because corneal clarity is essential for sharp vision.

herpetic keratitis is an infection or inflammation of the cornea caused most often by herpes simplex virus (HSV). The cornea is the clear, dome-shaped front surface of the eye that helps focus vision. This condition is commonly discussed in eye clinics because it can affect vision and can recur over time. The term is used in ophthalmology and optometry to describe a specific pattern of corneal disease linked to herpes viruses.

acanthamoeba keratitis is an infection of the cornea (the clear front “window” of the eye) caused by Acanthamoeba organisms. It is discussed in eye care because it can be vision-threatening and can be difficult to diagnose early. It is most commonly described in the context of contact lens wear, but it can also occur without contact lenses. In clinics and hospitals, the term is used to guide specific diagnostic tests and targeted anti-infective treatment.

fungal keratitis is an infection of the cornea caused by fungi. It can lead to a corneal ulcer, inflammation, and reduced vision. It is commonly discussed in eye emergency care, cornea clinics, and contact lens–related eye disease. It is also a core topic in ophthalmology and optometry training because early recognition can affect outcomes.

bacterial keratitis is an infection of the cornea caused by bacteria. It is commonly described as a corneal infection that can create an “ulcer” (an open sore) on the clear front surface of the eye. It is a clinical diagnosis used in ophthalmology and optometry to guide urgent evaluation, testing, and treatment planning. It is most often discussed in settings such as contact lens–related eye problems, eye trauma, and post-surgical care.

infectious keratitis is an infection of the cornea, the clear front “window” of the eye. It can cause pain, redness, light sensitivity, and blurred vision. It is commonly discussed in urgent eye care, emergency settings, and contact lens–related care. Clinicians use the term to describe corneal infection that may threaten vision if severe.

keratitis means inflammation of the cornea, the clear “window” at the front of the eye. It can be caused by infection, injury, dryness, immune conditions, or exposure problems. It is a common diagnosis in eye clinics and emergency settings because it can affect vision and comfort. Clinicians use the term to describe both mild surface irritation and more severe corneal ulceration.

necrotizing scleritis is a severe form of scleritis, meaning deep inflammation of the white outer wall of the eye (the sclera). “Necrotizing” refers to tissue damage and breakdown that can lead to thinning of the sclera. It is a clinical diagnosis used in ophthalmology to describe a high-risk, potentially vision-threatening eye condition. It is often discussed alongside systemic autoimmune (body-wide immune) diseases and urgent eye inflammation care.

scleritis is inflammation of the sclera, the tough white outer coat of the eye. It is most often discussed in ophthalmology and optometry because it can be painful and sometimes threatens vision. scleritis can be linked to systemic (whole-body) inflammatory or autoimmune disease, but it can also occur without a known cause. The term is used clinically to describe a specific pattern of deep eye-wall inflammation that needs careful evaluation.

episcleritis is an inflammation of the episclera, a thin tissue layer on the surface of the white of the eye. It commonly causes a localized or diffuse patch of eye redness and mild discomfort. The term is used in eye care to describe a generally superficial, non–vision-threatening cause of “red eye.” Clinicians use the diagnosis to separate episcleritis from deeper, more serious inflammation such as scleritis.

conjunctivochalasis is a condition where the clear membrane covering the white of the eye becomes loose and forms folds. These folds most often appear along the lower edge of the eyeball near the eyelid margin. It is commonly discussed in dry eye and ocular surface clinics because it can mimic or worsen irritation and tearing. The term is used by ophthalmologists and optometrists in exams, diagnoses, and treatment planning.

giant papillary conjunctivitis is an inflammatory condition of the inner eyelid surface. It features enlarged “papillae” (small, raised bumps) on the upper eyelid lining. It is commonly associated with contact lens wear or other long-term eye surface friction. Clinicians use the term to describe a recognizable exam pattern and symptom cluster.