Anterior segment of eyeball

Anterior segment of eyeball

Human eye Anterior Segment - Magnified view seen on examination with a slit lamp under diffuse illumination showing conjunctiva overlying the white sclera, transparent cornea, pharmacologically dilated pupil and cataract

Schematic diagram of the human eye.
Latin	segmentum anterius bulbi oculi

The anterior segment is the front third of the eye that includes the structures in front of the vitreous humour: the cornea, iris, ciliary body, and lens.^[1] ^[2]

Within the anterior segment are two fluid-filled spaces:

the anterior chamber between the posterior surface of the cornea (i.e. the corneal endothelium) and the iris.
the posterior chamber between the iris and the front face of the vitreous.^[1]

Aqueous humor fills these spaces within the anterior segment and provides nutrients to the surrounding structures.

Some ophthalmologists and optometrists specialize in the treatment and management of anterior segment disorders and diseases.^[2]

References

^ ^a ^b Cassin, B. and Solomon, S. Dictionary of Eye Terminology. Gainsville, Florida: Triad Publishing Company, 1990.
^ ^a ^b "Departments. Anterior segment." Cantabrian Institute of Ophthalmology.

Layers	Inner limiting membrane • Nerve fiber layer • Ganglion cell layer • Inner plexiform layer • Inner nuclear layer Outer plexiform layer • Outer nuclear layer External limiting membrane • Layer of rods and cones • Retinal pigment epithelium

Cells	Photoreceptor cells (Cone cell, Rod cell) → (Horizontal cell) → Bipolar cell → (Amacrine cell) → Retina ganglion cell (Midget cell, Parasol cell, Bistratified cell, Giant retina ganglion cells, Photosensitive ganglion cell) → Diencephalon: P cell, M cell, K cell Muller glia

Other	Macula (Foveola, Fovea centralis) • Optic disc (Optic cup)

Anterior segment

Other

anat(g/a/p)/phys/devp/prot

noco/cong/tumr, epon

proc, drug(S1A/1E/1F/1L)