chorioretinitis is inflammation of the choroid and the retina, two closely related layers at the back of the eye. It is a clinical term used in ophthalmology to describe a pattern of retinal and choroidal involvement seen on eye exam and imaging. The condition can be caused by infections, immune-mediated inflammation, or other systemic diseases. It is commonly discussed in uveitis clinics, retina practices, and general eye care when evaluating new visual symptoms.

Leber hereditary optic neuropathy (LHON) is an inherited condition that can cause sudden or subacute loss of central vision. It primarily affects the optic nerve, the “cable” that carries visual signals from the eye to the brain. LHON is linked to changes in mitochondrial DNA, which is passed down through the maternal line. The term is commonly used in ophthalmology and neuro-ophthalmology when evaluating unexplained, painless central vision loss.

Usher syndrome is an inherited condition that affects both hearing and vision. It typically combines hearing loss with a progressive retinal disease called retinitis pigmentosa. Some forms also affect balance (vestibular function). The term is commonly used in ophthalmology, audiology, and genetic counseling to describe a specific syndromic cause of dual sensory impairment.

Leber congenital amaurosis is a group of inherited retinal diseases that cause severe vision loss from birth or early infancy. It affects how the retina senses light and sends visual signals to the brain. The term is commonly used in pediatric ophthalmology, retina clinics, and genetic eye disease services. It is also used in genetic testing reports and research on inherited blindness.

choroideremia is a rare, inherited eye disease that causes progressive loss of vision. It mainly affects the retina, retinal pigment epithelium (RPE), and choroid—layers that support light sensing and retinal health. It is most commonly discussed in ophthalmology clinics, genetic eye disease services, and low-vision care. It is also a term used in genetic counseling and research, including clinical trials.

cone-rod dystrophy is a group of inherited retinal disorders that primarily affect cone photoreceptors and later involve rod photoreceptors. It typically causes early problems with central vision, color vision, and light sensitivity, with night vision often affected later. The term is most commonly used in ophthalmology, optometry, retinal clinics, and genetic eye disease care. It describes a diagnosis and clinical pattern rather than a single test, medication, or surgical procedure.

Best disease is an inherited eye condition that affects the macula, the central part of the retina used for detailed vision. It is also called Best vitelliform macular dystrophy (BVMD). It is most commonly discussed in retina clinics and genetic eye disease evaluations. People often learn about it after an eye exam shows a characteristic “yellow” macular lesion or unexplained central vision changes.

Stargardt disease is an inherited eye condition that primarily affects the macula, the central part of the retina responsible for detailed vision. It is commonly described as a juvenile-onset macular dystrophy, although adult-onset forms also occur. The term *Stargardt disease* is used in eye clinics to name a specific diagnosis and to guide testing, counseling, and long-term monitoring. People often research it when they notice central vision changes such as blurred reading vision or difficulty recognizing faces.

inherited retinal dystrophy is a group of genetic (inherited) conditions that affect the retina, the light-sensing tissue at the back of the eye. It typically causes gradual changes in vision because retinal cells do not function normally or slowly degenerate over time. The term is commonly used in eye clinics, genetic testing reports, and research to describe these inherited retinal diseases. It includes several named diagnoses, such as retinitis pigmentosa and Stargardt disease.

retinitis pigmentosa is a group of inherited (genetic) eye conditions that affect the retina, the light-sensing tissue at the back of the eye. It most often causes gradual difficulty seeing in dim light and a progressive loss of side (peripheral) vision. It is commonly used as a clinical diagnosis term in ophthalmology, optometry, and genetic eye disease clinics. It is also used in research and clinical trials that focus on inherited retinal degeneration.

retinal vasculitis is inflammation affecting blood vessels in the retina. The retina is the light-sensing tissue lining the back of the eye. This condition is discussed in eye clinics when evaluating retinal inflammation, vision changes, or unexplained retinal bleeding. It is also used as a clinical diagnosis and a descriptive finding on retinal imaging.

Hollenhorst plaque is a small, bright, reflective deposit seen inside a retinal arteriole during an eye exam. It usually represents a cholesterol embolus (a tiny piece of fatty material traveling in the bloodstream). Clinicians most often identify it on a dilated retinal examination or retinal imaging. It is used as an eye finding that can signal underlying vascular (blood vessel) disease elsewhere in the body.

A retinal embolus is a small piece of material that travels in the bloodstream and becomes lodged in a retinal blood vessel. It is most often discussed in eye exams when clinicians look at the retina during a dilated fundus evaluation. A retinal embolus can be an incidental finding or appear in the setting of sudden vision symptoms. The term is commonly used in ophthalmology, optometry, and vascular medicine because it may reflect disease outside the eye.

hypertensive retinopathy is damage to the retina and its blood vessels related to high blood pressure. It is identified by eye clinicians during a retinal examination, often with dilating eye drops. It can reflect how long and how severely blood pressure has affected small blood vessels in the body. It is commonly discussed in ophthalmology, optometry, and general medical care as a sign of “target-organ” effects of hypertension.

branch retinal artery occlusion is a blockage of a smaller artery that supplies the retina. The retina is the light-sensing tissue lining the back of the eye. This condition can cause sudden vision changes in part of the visual field. It is commonly discussed in emergency eye care, retina clinics, and stroke-risk evaluations.

BRAO stands for branch retinal artery occlusion. It is a blockage of a smaller artery that supplies blood to the retina. It typically causes sudden, painless changes in vision in part of one eye. BRAO is most commonly discussed in ophthalmology, optometry, emergency care, and stroke-risk evaluation.

central retinal artery occlusion is a sudden blockage of the main artery that supplies blood to the inner retina. It is a vision-threatening eye emergency that can cause abrupt, painless vision loss. Clinicians use the term to describe a specific pattern of retinal ischemia (lack of oxygenated blood flow). It is commonly discussed in ophthalmology, optometry, emergency medicine, neurology, and stroke care.

CRAO stands for **central retinal artery occlusion**. It is a condition where blood flow through the central retinal artery becomes blocked. This can cause sudden, significant vision loss because the retina is highly sensitive to reduced oxygen. CRAO is a term commonly used in **eye clinics, emergency settings, and hospital stroke-style evaluations** when urgent vision loss is being assessed.

retinal artery occlusion is a blockage of blood flow in an artery that supplies the retina. The retina is the light-sensing tissue lining the back of the eye that enables vision. This condition is commonly discussed in emergency eye care because it can cause sudden vision loss. Clinicians use the term to describe a specific pattern of retinal ischemia (lack of oxygen from reduced blood flow).

branch retinal vein occlusion is a retinal blood-flow condition where a small vein draining the retina becomes blocked. It can cause sudden or gradual blurred vision in part of one eye. It is most often discussed in eye clinics when evaluating retinal hemorrhage, swelling, or vision distortion. It is commonly diagnosed and monitored by ophthalmologists and optometrists using retinal imaging.