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.

The upper eyelid is the movable skin-and-muscle fold that covers the top part of the eye. It protects the eye and helps spread tears across the surface with each blink. Clinicians examine the upper eyelid in routine eye exams and when symptoms involve irritation, swelling, or drooping. It is also a focus in oculoplastic (eyelid) evaluation and surgery.

An eyelid is a movable fold of tissue that covers and protects the front of the eye. It opens for vision and closes for blinking and sleep. It helps spread tears across the eye surface to keep it comfortable and clear. The term is commonly used in eye exams, dry eye discussions, and eyelid-related surgery.

In eye care, the term **globe** means the **eyeball itself**. It refers to the rounded structure that focuses light and converts it into vision. Clinicians use “globe” to distinguish the eyeball from nearby structures like the eyelids and orbit. You will see it in exam notes, imaging reports, and trauma or surgical documentation.

The eyeball is the rounded, ball-like organ that captures light and enables vision. In clinical settings it is often called the “globe,” and it includes the cornea, lens, retina, and supporting tissues. In everyday language, “eyeball” may be used when people describe eye pain, redness, or injury. The term also appears in patient education, anatomy teaching, and discussions of eye examinations and surgery.

A medical retina specialist is an ophthalmologist who focuses on diagnosing and treating diseases of the retina using non-surgical methods. The retina is the light-sensing tissue lining the back of the eye that sends visual signals to the brain. This specialty is commonly involved in conditions like diabetic retinopathy and age-related macular degeneration. Care is often delivered in retina clinics using imaging, lasers, and eye injections, with follow-up over time.

A sonographer is a healthcare professional trained to perform ultrasound imaging. In eye care, a sonographer may help capture ultrasound scans of the eye and orbit when the view inside the eye is limited. Ultrasound uses high-frequency sound waves rather than X-rays. It is commonly used in hospitals, eye clinics, and surgical centers for diagnostic imaging and measurement.

A retinal photographer is a trained eye-care imaging professional who captures detailed pictures of the retina and related structures at the back of the eye. These images help clinicians document eye health and monitor change over time. retinal photographer services are commonly used in optometry practices, ophthalmology clinics, hospitals, and screening programs. The work often includes multiple imaging methods, not just standard “photos.”

An ophthalmic technician is an eye-care clinical staff member who supports ophthalmologists and, in some settings, optometrists. They collect eye and vision measurements, perform standardized diagnostic tests, and document findings for the clinician. They are commonly found in ophthalmology clinics, surgical centers, and hospital eye departments. Their role helps the visit run efficiently while keeping testing consistent and well documented.

An ophthalmic nurse is a registered nurse who specializes in eye (ocular) health and eye-care delivery. They commonly work in ophthalmology clinics, surgical centers, and hospital eye units. Their role combines general nursing skills with ophthalmology-specific assessment, testing, patient education, and perioperative care. What an ophthalmic nurse can do varies by country, setting, and scope-of-practice rules.

An ocularist is a healthcare artisan who designs, fits, and maintains custom ocular prostheses (artificial eyes). The work is most commonly used after eye removal surgery or when a non-seeing eye is cosmetically abnormal. ocularist services are typically coordinated with ophthalmologists, especially oculoplastic and orbital specialists.

A low vision specialist is a clinician focused on helping people use their remaining vision more effectively. It is commonly used when glasses, contact lenses, or standard medical care do not restore functional vision. The work is usually part of low vision rehabilitation, which emphasizes day-to-day tasks and independence. Care may occur in optometry or ophthalmology settings and often involves coordinated rehabilitation services.

A vision therapist is a trained eye-care professional who helps deliver structured vision therapy activities. A vision therapist commonly works in an optometry or ophthalmology clinic as part of a supervised care team. The work focuses on how the eyes coordinate, focus, and process visual information, not on surgery. The exact role, training pathway, and job title vary by country and clinic.

optician is a trained eye care professional focused on eyeglasses and, in some settings, contact lens dispensing. optician commonly works in optical shops, clinics, and hospital-based eye services. optician uses a vision prescription written by an optometrist or ophthalmologist to help select, fit, and adjust eyewear. optician role is practical and optics-based rather than diagnostic or surgical.