Aqueous humor

Options

A. Is the pigment responsible of the black colour of the choroid
B. Exits the eye through the canal of schlemm
C. Can cause cataracts if over produced
D. Is secreted by iris

Answer

### Step-by-Step Solution for the Question on Aqueous Humor

1. **Definition of Aqueous Humor**:
- Aqueous humor is a transparent fluid found in the anterior chamber of the eye. It is produced by the ciliary epithelium.

2. **Location in the Eye**:
- The eye is divided into two main chambers: the anterior chamber (which contains the aqueous humor) and the posterior chamber (which contains the vitreous humor). The aqueous humor is specifically located in the aqueous chamber at the front of the eye.

3. **Composition**:
- Aqueous humor is rich in proteins and nutrients, making it a proteinaceous fluid. It is essential for maintaining the health of the eye structures.

4. **Function**:
- The primary role of aqueous humor is to provide nourishment to the avascular structures of the eye, particularly the cornea and lens. It supplies essential nutrients, such as amino acids and other proteins, necessary for these structures.

5. **Production and Drainage**:
- Aqueous humor is secreted by the ciliary epithelium, which is part of the ciliary body. After its secretion, it exits the eye through the canal of Schlemm (also known as the scleral venous sinus).

6. **Effects of Overproduction**:
- If the aqueous humor is overproduced or not drained properly, it can lead to increased intraocular pressure, which is a risk factor for cataracts and other eye conditions.

7. **Common Misconceptions**:
- It is important to clarify that the aqueous humor is not responsible for the black color of the choroid; that is due to the pigment in the choroidal layer itself. Additionally, it is not secreted by the iris, but rather by the ciliary body.