The retina is a thin, light-sensitive layer of nerve tissue lining the inside back wall of the eye. It converts light into electrical signals that the brain interprets as vision. Clinically, retina is used to describe both the structure itself and the focus of exams, imaging, and treatments aimed at retinal disease. It is commonly discussed in eye care visits when evaluating vision changes, diabetes-related eye findings, and age-related vision problems.

The posterior hyaloid is the back surface layer of the vitreous gel inside the eye. It lies next to the retina and forms an important interface where traction can occur. Clinicians describe it when evaluating floaters, retinal disease, and vitreoretinal traction. It is commonly referenced in OCT imaging, ultrasound exams, and vitrectomy surgery.

hyaloid is an ophthalmology term that refers to structures related to the vitreous body, the clear gel that fills the center of the eye. It most commonly describes the thin surface layer of the vitreous (the anterior or posterior hyaloid) and certain fetal blood vessel remnants (the hyaloid artery system). Clinicians use hyaloid language when describing vitreous anatomy, retinal exams, imaging findings, and vitreoretinal surgery. It is a descriptive term rather than a medication or a standalone treatment.

vitreous humor is the clear, gel-like substance that fills the large space inside the eye behind the lens. It helps the eye keep its shape and provides a transparent path for light to reach the retina. Clinicians discuss vitreous humor when evaluating floaters, flashes, bleeding inside the eye, and retinal conditions. It is also central to several common retinal tests and surgeries.

The vitreous is the clear, gel-like substance that fills most of the inside of the eye. It sits behind the lens and in front of the retina, helping maintain the eye’s shape. Clinicians discuss the vitreous when evaluating floaters, flashes, bleeding, inflammation, or retinal disease. It is also a key space used during certain eye procedures, including vitrectomy and intravitreal injections.

angle recess is the deepest part of the eye’s anterior chamber angle, where the cornea and iris meet internally. It is an anatomic landmark doctors look at when evaluating the eye’s fluid drainage pathway. It is most commonly discussed during gonioscopy and glaucoma-related examinations. It can also be referenced when describing changes after eye trauma or certain eye diseases.

The iridocorneal angle is the internal angle where the iris meets the cornea at the front of the eye. It contains the eye’s main drainage structures for the fluid inside the eye (aqueous humor). Clinicians look at this area to understand eye pressure risk and certain types of glaucoma. It is commonly assessed during eye exams using gonioscopy or anterior-segment imaging.

collector channels are tiny drainage pathways in the eye. They help move clear fluid (aqueous humor) out of the front of the eye. They are part of the natural “outflow” system that helps regulate eye pressure. They are commonly discussed in glaucoma evaluation and glaucoma-related surgery.

Schlemm canal is a circular drainage channel in the front of the eye. It helps fluid leave the eye to keep eye pressure within a healthy range. It sits at the junction of the clear cornea and the white sclera (the limbus). It is commonly discussed in glaucoma care, especially in exams and pressure-lowering procedures.

The trabecular meshwork is a tiny drainage tissue inside the front of the eye. It helps fluid leave the eye to maintain normal eye pressure. It sits at the eye’s “drain” where the cornea and iris meet. It is commonly discussed in glaucoma exams and treatments.

aqueous production is the eye’s natural process of making aqueous humor, a clear fluid in the front of the eye. It is mainly produced by the ciliary body, a structure behind the iris. This fluid helps maintain eye pressure and supports the health of internal eye tissues. It is commonly discussed in glaucoma care, eye inflammation, and post-surgical monitoring.

aqueous humor is a clear fluid that fills the front part of the eye. It sits between the cornea and the lens and is continuously made and drained. It helps the eye keep its shape and supports normal vision. In clinics, it is discussed most often in glaucoma, inflammation, eye injury, and eye surgery.

The posterior chamber is a small, fluid-filled space in the front part of the eye. It sits behind the iris (the colored part) and in front of the natural lens and its support structures. It contains aqueous humor, the clear fluid that helps maintain eye pressure and nourish tissues. In clinical care, the posterior chamber is discussed in eye exams, glaucoma evaluation, and lens surgery planning.

The anterior chamber is the fluid-filled space at the front of the eye. It sits between the cornea (the clear window) and the iris (the colored part), in front of the lens. It contains aqueous humor, a clear fluid that helps maintain eye pressure and nourish nearby tissues. Clinicians refer to the anterior chamber in eye exams, glaucoma evaluation, eye injuries, and many eye surgeries.

The **lens nucleus** is the dense, central core of the eye’s natural crystalline lens. It helps focus light onto the retina and contributes to clear vision. Clinicians commonly discuss the lens nucleus when evaluating **cataracts**, especially **nuclear sclerosis** (age-related hardening/yellowing). It is also a key focus in planning and performing **cataract surgery**, where the nucleus is broken up and removed.

The lens cortex is the outer, softer layer of the eye’s natural crystalline lens. It surrounds the denser central nucleus and sits just beneath the lens capsule. It helps the lens stay clear and focus light onto the retina for sharp vision. The term is commonly used in eye exams and cataract surgery planning.

The posterior capsule is the thin, clear back layer of the eye’s natural lens capsule. It sits behind the lens fibers and in front of the vitreous gel in the center of the eye. It is most commonly discussed in cataract surgery because it helps support an artificial lens implant. It is also central to a common late change after cataract surgery called posterior capsule opacification.

The anterior capsule is the front, clear “wrapper” of the eye’s natural lens. It is a thin, transparent membrane that helps contain and shape the lens. Clinicians most often discuss it during cataract evaluation and cataract surgery. It also matters when assessing lens stability, inflammation, or certain post-surgery changes.

The lens capsule is a thin, clear membrane that surrounds the eye’s natural crystalline lens. It acts like a flexible “bag” that holds the lens in place and helps maintain its shape. Clinicians most often talk about the lens capsule in the context of cataracts and cataract surgery. It is also discussed when capsule-related changes affect vision after surgery.

The crystalline lens is the clear, flexible structure inside the eye that helps focus light onto the retina. It sits behind the iris (the colored part of the eye) and in front of the vitreous (the gel in the back of the eye). Clinicians discuss the crystalline lens when explaining focusing, age-related vision changes, and cataracts. It is also central to many eye exams and to cataract surgery planning.