corneal staining is a clinical finding where a dye highlights areas of the cornea that are damaged, irregular, or unprotected. It is most commonly seen during an eye exam under a slit-lamp microscope. Clinicians use it to make otherwise subtle surface problems easier to see and document. It is widely used in optometry and ophthalmology for evaluating dry eye, injuries, infections, and contact lens-related issues.
rubeosis iridis means abnormal new blood vessel growth on the iris, the colored part of the eye. It is most often discussed as an exam finding that signals reduced oxygen (ischemia) inside the eye. Clinicians use the term in eye clinics and emergency settings because it can precede serious pressure problems. It is commonly linked to retinal diseases that drive new vessel formation.
drusen are small deposits of extracellular material that can be seen in and around the retina. They are most commonly discussed as a clinical finding related to age-related macular degeneration (AMD). The term is also used for optic nerve head drusen, which are deposits at the optic disc. In everyday practice, drusen are “something the eye doctor sees” during imaging and examination, not a treatment you “get.”
hard exudates are yellow-white retinal deposits made from leaked blood lipids and proteins. They are a clinical sign seen during eye exams and retinal imaging. They commonly appear in conditions that cause retinal blood vessel leakage, such as diabetic eye disease. Clinicians use them to help describe disease activity, location, and potential risk to central vision.
cotton wool spots are small, pale, fluffy-looking patches seen on the retina during an eye exam. They represent a sign of injury in the retinal nerve fiber layer (the layer carrying visual signals to the brain). They are commonly discussed in diabetic and hypertensive eye disease, but can appear in other conditions. Clinicians use them as a clue that the retina (and sometimes the body) may be under vascular stress.
retinal hemorrhage means bleeding within or near the retina, the light-sensing tissue at the back of the eye. It is a clinical finding seen during a dilated eye exam or on retinal imaging. It can be associated with eye diseases, systemic conditions, or trauma. The term is commonly used in ophthalmology, optometry, emergency care, and diabetes or hypertension screening.
optic atrophy is a clinical term for damage to the optic nerve that results in loss of nerve fibers. It is commonly described by eye care clinicians when the optic disc looks pale and vision function is reduced. It is used in ophthalmology, optometry, neurology, and neuro-ophthalmology to communicate optic nerve injury. It is a finding and diagnosis category, not a single disease or a single procedure.
optic disc pallor means the optic disc (the visible head of the optic nerve) looks paler than expected on an eye exam. It is a clinical sign that can suggest past or ongoing damage to optic nerve fibers. It is most often described during a dilated fundus exam, optic nerve photography, or documentation for referral. It is used in eye care and neuro-ophthalmology as a clue that vision pathways may be affected.
papilledema is swelling of the optic disc caused by raised pressure inside the skull. The optic disc is the spot where the optic nerve enters the eye. This term is used in eye care and neurology because it can signal a problem affecting the brain, cerebrospinal fluid, or blood flow. It is usually identified during a dilated eye exam and supported by imaging tests.
optic disc swelling means the optic disc (the visible “head” of the optic nerve inside the eye) looks swollen on examination. It is a clinical sign, not a diagnosis by itself. It is most commonly discussed in eye exams, emergency evaluations for vision symptoms, and neurology-related workups. Clinicians use it as a clue to problems affecting the optic nerve, the retina, or pressure around the brain.
vitritis is inflammation within the vitreous, the clear gel that fills the center of the eye. It usually appears as floating inflammatory cells or “haze” seen during an eye exam. Clinicians use the term to describe a sign of intraocular inflammation rather than a single disease. It is most commonly discussed in the context of uveitis, infection, or other retinal and immune-related conditions.
vitreous haze is a clinical term for cloudiness seen within the vitreous, the clear gel that fills the back of the eye. It is usually a sign of inflammation, infection, bleeding, or debris inside the eye rather than a condition by itself. Clinicians use vitreous haze to describe severity and to track change over time. It is commonly discussed in uveitis care, retina clinics, and clinical research.
keratic precipitates are small deposits of inflammatory cells and proteins on the inner surface of the cornea. They are seen during an eye exam, most commonly with a slit-lamp microscope. They usually indicate inflammation inside the front part of the eye (anterior uveitis or related conditions). Clinicians use them as a visible clue to help diagnose, classify, and monitor ocular inflammation.
cells and flare is a slit-lamp exam finding that signals inflammation inside the front part of the eye. “Cells” are tiny inflammatory cells seen floating in the aqueous fluid of the anterior chamber. “Flare” is a hazy light-scattering effect caused by increased protein in that same fluid. It is most commonly used to detect and monitor conditions like uveitis and postoperative inflammation.
hypopyon is a visible layer of white blood cells (pus-like inflammatory material) that settles in the front chamber of the eye. It appears as a whitish or yellowish fluid level behind the cornea. It is most commonly discussed in eye exams when clinicians evaluate severe inflammation or infection. The term is used in ophthalmology and optometry to describe a sign, not a diagnosis by itself.
hyphema is blood inside the front chamber of the eye, in the space between the cornea and the iris. It is most commonly seen after eye trauma, but it can also occur from certain eye or blood conditions. Clinicians use the term hyphema when documenting exams, monitoring risk, and planning management. Patients may notice blurred vision, light sensitivity, or a visible “pool” of blood in the eye.
corneal edema means swelling of the cornea, the clear front “window” of the eye. It happens when extra fluid builds up inside the corneal tissue. This swelling can make vision look blurry, hazy, or “foggy,” and may cause glare. The term is commonly used in eye exams, emergency eye evaluations, and post-surgical follow-up.
corneal haze is a loss of normal corneal clarity that makes the cornea look slightly cloudy. It is a clinical finding rather than a single disease, and it can range from subtle to obvious. It is commonly discussed after eye injuries, infections, inflammation, and refractive surgery. Clinicians use the term to describe what they see on exam and how it may affect vision.
An afferent pupillary defect is a clinical sign found during an eye exam. It means one eye sends a weaker “light signal” to the brain than the other eye. It is commonly checked with a light test called the swinging flashlight test. Clinicians use it to help evaluate optic nerve and retinal health.
relative afferent pupillary defect is an exam finding that suggests one eye is sending a weaker light signal to the brain than the other eye. It is detected by comparing how the pupils respond when light is moved between the two eyes. It is commonly used in eye clinics and emergency settings as a quick screen for optic nerve or severe retinal problems. It is also taught early in ophthalmology and optometry because it helps localize disease to the “input” (afferent) visual pathway.