The Choroid: Eye's Middle Layer | Generated by AI
The choroid is the middle layer of the eye, located between the retina (inner layer) and the sclera (the white outer layer).
Its main functions are:
- Supplies oxygen and nutrients to the outer layers of the retina through its rich network of blood vessels.
- Absorbs excess light because it contains melanin (dark pigment), which helps reduce light scattering inside the eye and improves the quality of vision.
- Helps regulate the temperature of the retina by maintaining blood flow.
Think of the eye as having three coats:
- Outer coat: Sclera and cornea (protection)
- Middle coat (uvea): Choroid, iris, and ciliary body (blood supply and support)
- Inner coat: Retina (detects light and sends visual signals to the brain)
The choroid is essential for keeping the retina healthy. Diseases affecting the choroid, such as inflammation (choroiditis) or abnormal blood vessel growth, can lead to vision problems or vision loss.
A simple way to remember it is:
- Retina = sees light
- Choroid = nourishes the retina
- Sclera = protects the eye
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