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.

RAPD stands for **relative afferent pupillary defect**. It is a **pupil response finding** that can suggest reduced input from one eye to the brain. RAPD is most commonly checked during a routine eye exam using a **light-shining test**. Clinicians use it to help evaluate the **optic nerve and retina**.

mydriasis means dilation (widening) of the pupil, the black opening in the center of the eye. It can happen naturally in dim light or from emotions, medications, or certain eye and nerve conditions. In eye care, mydriasis is commonly created on purpose using eyedrops to improve the view inside the eye. It is also discussed clinically as a sign that can help localize neurologic or ocular problems.

miosis is the medical term for a pupil that is smaller than expected. It can be a normal response to bright light or near focusing. It can also be a clinical sign of medication effects or certain eye or neurologic conditions. Clinicians also intentionally create miosis during some eye treatments and surgeries.

anisocoria means the two pupils are different sizes. The pupils are the black centers of the eyes that change size with light and focus. anisocoria is a clinical finding, not a disease by itself. It is commonly discussed in eye exams, emergency evaluation, and neurologic assessment.

enophthalmos means the eye sits farther back in the eye socket than usual. It is a clinical finding that can affect appearance and sometimes eye function. Clinicians use the term when describing orbital (eye socket) disease, injury, or tissue loss. It is commonly discussed in ophthalmology, optometry, ENT, and facial trauma care.

proptosis means the eye appears pushed forward from the orbit (the bony eye socket). It is a clinical sign, not a diagnosis, and it can be mild or pronounced. Clinicians use the term in eye care, emergency care, endocrinology, and radiology. It is commonly discussed when evaluating “bulging eyes” or orbital disease.