The uvea is the middle, vascular (blood vessel–rich) layer of the eye. It includes the iris, ciliary body, and choroid. In plain terms, it helps control pupil size, focus, and nourishment of the eye’s inner tissues. Clinically, “uvea” is used when describing eye anatomy, inflammation (uveitis), tumors, and many exam findings.

corneal nerves are tiny nerve fibers that run through the cornea, the clear front window of the eye. They help you feel touch, dryness, and pain on the eye surface. They also support normal tear production and blinking reflexes. In clinic, they are commonly discussed when evaluating dry eye, corneal healing, and certain types of eye pain.

keratocytes are specialized cells found mainly in the corneal stroma, the thick, clear middle layer of the cornea. They help maintain corneal clarity by supporting the structure and chemistry of the stromal tissue. In clinical eye care, keratocytes are discussed when explaining corneal health, scarring (haze), and wound healing. They are also a common focus in corneal imaging, pathology reports, and ophthalmology research.

The corneal endothelium is the innermost, single-cell layer of the cornea (the clear “window” at the front of the eye). It helps keep the cornea clear by controlling fluid balance. Clinicians discuss it when evaluating corneal swelling, cataract surgery risk, and corneal transplant options. It is also commonly measured in eye clinics using specialized imaging tests.

Descemet membrane is a thin, clear layer inside the cornea, the eye’s front “window.” It sits just in front of the corneal endothelium, the single-cell layer that helps keep the cornea clear. In plain terms, it is a supportive sheet that helps the inner cornea function normally. It is commonly discussed in corneal disease and in corneal transplant procedures that target the cornea’s inner layers.

The corneal stroma is the thick, clear middle layer of the cornea at the front of the eye. It is made mostly of collagen and water arranged in a highly organized pattern. Its structure helps the cornea stay transparent while maintaining strength and shape. Clinicians discuss the corneal stroma in eye exams, imaging, corneal disease care, and corneal surgery planning.

Bowman’s layer is a thin, tough layer in the front part of the cornea (the clear “window” of the eye). It sits just under the corneal epithelium and above the corneal stroma. It helps the cornea keep its shape and provides structural support. It is commonly discussed in corneal disease, corneal imaging, and refractive and corneal surgery planning.

The corneal epithelium is the thin, clear outer “skin” on the very front of the eye. It is the first layer of the cornea, the transparent window you look through. It helps keep vision clear and protects the eye from the outside environment. Clinicians discuss it often in dry eye care, contact lens fitting, infections, injuries, and refractive surgery planning.

The cornea is the clear, curved “window” at the very front of the eye. It helps focus light and also acts as a protective barrier. Clinicians evaluate the cornea during routine eye exams and when diagnosing eye disease. Many vision-correction and eye-surface treatments involve the cornea directly.

The episclera is a thin layer of connective tissue that lies on top of the sclera (the white of the eye). It contains many small blood vessels that can become visible when the eye is irritated or inflamed. Clinicians use the term episclera when describing red-eye causes, eye pressure physiology, and surgical tissue planes. It is commonly discussed in conditions like episcleritis and in glaucoma-related anatomy.

The sclera is the tough, white outer coat of the eye. It helps the eye keep its shape and protects the delicate tissues inside. Clinicians examine it during routine eye checks because color and contour can signal disease. It is also used as a structural “anchor” in several contact lens and surgical techniques.

The limbus is the narrow border zone where the clear cornea meets the white sclera. It is a key landmark on the front of the eye used in eye exams, contact lens fitting, and eye surgery. It also contains specialized cells that help maintain the corneal surface. Clinicians use the limbus to describe locations, measure changes, and plan treatments.

The conjunctival fornix is the curved “pocket” where the inner eyelid lining folds back to meet the eye’s surface lining. It sits behind the upper and lower eyelids and is part of the conjunctiva, a thin mucous membrane. Clinicians commonly examine it to look for irritation, scarring, or hidden debris. It is also a practical space where eye drops and ointments are often placed.

The palpebral conjunctiva is the thin, moist membrane that lines the inside of the eyelids. It is part of the conjunctiva, the surface tissue that helps protect and lubricate the eye. Clinicians examine the palpebral conjunctiva often during routine eye exams and red-eye evaluations. It is also a key landmark in diagnosing eyelid- and ocular-surface conditions.

bulbar conjunctiva is the thin, clear membrane that covers the white part of the eye (the sclera). It is normally transparent, so the underlying sclera looks white and the surface blood vessels are visible. Clinicians look at bulbar conjunctiva during most eye exams because it often shows early signs of irritation or inflammation. It is also involved in several diagnostic tests and surgical approaches on the eye surface.

The conjunctiva is a thin, clear tissue that lines the inside of the eyelids and covers the white part of the eye. It helps protect and lubricate the eye’s surface. Clinicians examine the conjunctiva to assess eye irritation, infection, allergies, and systemic health clues. Many eye drops and contact lenses interact with the conjunctiva during routine eye care.

plica semilunaris is a small, crescent-shaped fold of conjunctiva at the inner corner of the eye. It sits next to the lacrimal caruncle (the pink tissue at the medial canthus). It is a normal anatomical structure and is present in everyone. In eye care, it is commonly referenced during slit-lamp exams and when describing medial-eye findings.

The caruncle is the small, pink, fleshy bump at the inner corner of the eye near the nose. It sits beside the tear drainage area and is part of the tissues of the medial canthus (inner eyelid corner). Clinicians use the caruncle as an anatomic landmark and examine it for irritation, infection, or growths. Patients often notice it when it looks swollen, red, or develops a new spot.

The lateral canthus is the outer corner where the upper and lower eyelids meet. It is a normal anatomical landmark that helps define eyelid shape and support. Clinicians reference it during eye exams, eyelid measurements, and facial assessment. It is also a key area in some emergency and reconstructive eyelid procedures.

The medial canthus is the inner corner of the eye where the upper and lower eyelids meet, closest to the nose. It is an important anatomical landmark in routine eye exams and facial measurements. Clinicians also reference it when evaluating tear drainage, eyelid position, and injuries near the inner eyelid. The term is commonly used in ophthalmology, optometry, emergency care, and oculoplastic surgery.