Which of the following is not part of the vascular layer of the eye?

• A. Iris
• B. Ciliary body
• C. Choroid
• D. Retina

Answer: (D)

Verified step by step guidance

1. Understand the structure of the eye: The eye is composed of three main layers - the fibrous layer, the vascular layer, and the inner layer.
2. Identify the components of the vascular layer: The vascular layer, also known as the uvea, includes the iris, ciliary body, and choroid.
3. Recognize the function of each component: The iris controls the diameter of the pupil, the ciliary body produces aqueous humor and controls lens shape, and the choroid provides blood supply to the retina.
4. Differentiate the retina: The retina is part of the inner layer of the eye, responsible for receiving light and converting it into neural signals.
5. Conclude which part is not in the vascular layer: Since the retina is part of the inner layer, it is not included in the vascular layer of the eye.