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.
The canthus is the corner of the eye where the upper and lower eyelids meet. Each eye has a medial canthus (near the nose) and a lateral canthus (toward the temple). Clinicians use the term canthus to describe normal anatomy, eyelid alignment, and surgical landmarks. The canthus is also referenced in trauma care and in procedures that repair or reposition the eyelids.
tarsus is the firm, supportive “plate” inside each eyelid. It helps the eyelids keep their shape and contact the eye smoothly during blinking. Clinicians refer to tarsus during eyelid exams, eyelid disease discussions, and many eyelid surgeries. You may also see it called the *tarsal plate* in textbooks and surgical notes.
The tarsal plate is a firm, flexible layer of connective tissue inside each eyelid. It gives the eyelid its shape and structural support. It also helps anchor eyelid muscles and houses oil-producing glands. Clinicians commonly reference it during eyelid exams and eyelid surgeries.
The lash line is the edge of the eyelid where the eyelashes emerge. It sits at the junction between the outer skin of the lid and the inner lid surface that touches the eye. In everyday use, “lash line” often refers to where eyeliner is applied. In clinical eye care, it is a key landmark for examining eyelid health and tear film function.
The eyelid margin is the thin edge of the upper and lower eyelids that meets when you blink. It includes the eyelashes, oil gland openings, and the transition from skin to the inner lid lining. Clinicians use the eyelid margin as a key landmark during routine eye exams and eye-surface evaluations. It is also referenced in diagnosing eyelid disease and planning eyelid-related procedures.
The palpebral fissure is the opening between the upper and lower eyelids. It is the space you see when the eye is “open,” including the exposed part of the eyeball. Clinicians use the palpebral fissure to describe eyelid position and eye exposure. It commonly appears in eye exams, eyelid surgery planning, and documentation of eye and nerve conditions.
The lower eyelid is the movable skin-and-muscle fold that forms the lower boundary of the eye opening. It helps protect the eye surface and supports the tear film that keeps vision clear and comfortable. Clinicians evaluate the lower eyelid during routine eye exams and when eye irritation, watering, or lid position problems occur. It is also a key structure in many eye surface, tear drainage, and eyelid surgeries.