The neuroretinal rim is the ring of optic nerve tissue seen at the edge of the optic disc (the “optic nerve head”) inside the eye. It represents the nerve fiber bundles that carry visual information from the retina to the brain. Clinicians commonly assess the neuroretinal rim during eye exams and imaging when evaluating glaucoma and other optic nerve conditions. In plain terms, it is the “healthy nerve tissue border” around the optic nerve’s central cup.

The optic nerve head is the visible “front end” of the optic nerve inside the eye. It is the spot where retinal nerve fibers exit the eye to carry visual signals to the brain. Clinicians also call it the optic disc, and it is routinely assessed during eye exams and imaging. Its appearance can provide clues about glaucoma, optic nerve disease, and increased pressure around the brain.

The optic disc is the spot inside the back of the eye where the optic nerve enters the retina. It is sometimes called the optic nerve head in clinical contexts. It is visible during a dilated eye exam and on retinal imaging. Clinicians use optic disc appearance to assess eye and neurologic health.

The choriocapillaris is a thin layer of very small blood vessels in the back of the eye. It sits within the choroid, just beneath the retinal pigment epithelium (RPE). Its main role is to help supply oxygen and nutrients to the outer retina. In modern eye care, it is commonly discussed when interpreting retinal imaging and choroidal disease.

The choroid is a vascular (blood vessel–rich) layer inside the eye. It sits between the retina and the sclera (the white outer coat of the eye). Its main role is to supply oxygen and nutrients to parts of the retina involved in vision. In eye care, the choroid is commonly discussed in retinal imaging, diagnosis, and treatment planning.

The inner plexiform layer is a thin, important layer inside the retina. It is where retinal nerve signals are “wired together” through many tiny connections. Clinicians most often reference it in retinal imaging reports, especially OCT scans. It is also used in teaching and research to explain how vision signals are processed.

The outer plexiform layer is a thin layer inside the retina at the back of the eye. It is where light-sensing cells connect to the next set of retinal nerve cells. It helps the retina begin turning visual information into signals the brain can use. It is commonly discussed in retinal anatomy, optical coherence tomography (OCT), and disease evaluation.

The inner limiting membrane (ILM) is the retina’s innermost surface layer. It forms the boundary between the retina and the vitreous gel inside the eye. Clinicians most often discuss the inner limiting membrane (ILM) in macular diseases seen on OCT scans. It is also a key structure in vitreoretinal surgery, where it may be peeled to relieve retinal traction.

ganglion cells are nerve cells that carry visual signals from the retina to the brain. In eye care, the term usually refers to retinal ganglion cells. They are commonly discussed in glaucoma, optic nerve disease, and vision testing. Clinicians often assess ganglion cells with imaging and functional tests.

bipolar cells are nerve cells in the retina that relay visual signals. They sit between photoreceptors (rods and cones) and ganglion cells (the optic nerve output). They help transform light-driven signals into the patterns the brain can interpret as vision. In eye care, they are most commonly discussed in retinal disease, electroretinography testing, and vision science.

cones are specialized light-sensing cells in the retina. They support sharp central vision, color perception, and vision in brighter light. cones are most concentrated in the macula, especially the fovea. They are commonly discussed in eye exams, retinal disease evaluation, and vision science.

rods are specialized light-sensing nerve cells (photoreceptors) in the retina. They support vision in dim light and help with motion detection and peripheral vision. rods are commonly discussed when explaining night vision, dark adaptation, and certain retinal diseases. Clinicians also refer to rods when interpreting retinal imaging and functional vision tests.

photoreceptors are specialized light-sensing cells in the retina at the back of the eye. They convert light into signals the brain can interpret as vision. They are commonly discussed in eye exams, retinal imaging, and tests of night vision and color vision. They are also central to understanding many inherited and age-related retinal diseases.

Bruch membrane is a thin, layered tissue inside the back of the eye. It sits between the retinal pigment epithelium (RPE) and the choroid (the eye’s vascular layer). It helps support the retina and acts as a regulated “exchange surface” for nutrients and waste. In eye care, it is commonly discussed when interpreting retinal imaging and conditions like age-related macular degeneration.

The retinal pigment epithelium (RPE) is a thin, pigmented layer of cells at the back of the eye. It sits between the light-sensing retina and a blood-rich layer called the choroid. It supports retinal health by feeding, protecting, and maintaining the photoreceptors that enable vision. It is commonly discussed in eye exams, retinal imaging reports, and conditions such as age-related macular degeneration.

perifovea is a specific region of the retina near the center of vision. It forms a ring-like zone around the fovea, within the macula. Clinicians use the term to describe where certain retinal findings are located. It is commonly referenced in retinal imaging (such as OCT) and in disease descriptions.

parafovea is a small ring-shaped region of the retina that surrounds the fovea, the area responsible for the sharpest central vision. It sits within the macula, the central part of the retina used for detailed tasks like reading and recognizing faces. Clinicians use the term parafovea when describing retinal anatomy, test results, and imaging findings around the very center of vision. It is commonly referenced in exams and imaging for macular disease, glaucoma-related central changes, and medication monitoring.

The **foveola** is the tiny central depression at the very center of the macula in the retina. It is the part of the eye most associated with **sharp, detailed central vision**. Clinicians use the term foveola when describing retinal anatomy, eye imaging, and macular disease. It is commonly referenced in ophthalmology exams, OCT scans, and surgical planning discussions.

The fovea is a small central area of the retina responsible for sharp, detailed vision. It is the point your eyes use for reading, recognizing faces, and focusing on fine detail. In clinical care, the fovea is a key landmark for eye exams, imaging, and diagnosis. It is commonly referenced in ophthalmology, optometry, and vision science.

The macula is a small, specialized area near the center of the retina at the back of the eye. It is responsible for detailed central vision used for reading, recognizing faces, and seeing fine detail. The term macula is commonly used in eye exams, retinal imaging, and diagnoses such as macular degeneration. Clinicians also use it to describe where certain retinal diseases or treatments are located.