What is the function of the choroid?

What is the function of the choroid?

• A. To produce aqueous humor
• B. To regulate accommodation
• C. To provide blood supply to the outer retina
• D. To house the iris pigment

Answer: (C)

The main idea is that the choroid is a highly vascular layer that nourishes the outer retina. Its dense network of blood vessels, especially the choriocapillaris, delivers oxygen and nutrients to the photoreceptors (rods and cones) and helps remove waste, which is essential for healthy outer retinal function. Aqueous humor is produced by the ciliary body, not the choroid. Accommodation is controlled mainly by the ciliary muscle and lens, not the choroid. The pigment that colors the iris is located in the iris itself, not housed in the choroid. So the choroid’s primary role is providing the blood supply to the outer retina.

The main idea is that the choroid is a highly vascular layer that nourishes the outer retina. Its dense network of blood vessels, especially the choriocapillaris, delivers oxygen and nutrients to the photoreceptors (rods and cones) and helps remove waste, which is essential for healthy outer retinal function. Aqueous humor is produced by the ciliary body, not the choroid. Accommodation is controlled mainly by the ciliary muscle and lens, not the choroid. The pigment that colors the iris is located in the iris itself, not housed in the choroid. So the choroid’s primary role is providing the blood supply to the outer retina.