**Core Concept:** The vitreous humor is a clear, gel-like substance that fills the space between the lens and the retina in the human eye. It plays a crucial role in maintaining the shape of the eye and transmitting light to the retina.

**Why the Correct Answer is Right:** The attachment of the vitreous humor is strongest at the ora serrata, which is the border between the vitreous humor and the aqueous humor (the clear liquid that fills the front part of the eye). This strong attachment is due to the presence of collagen fibers in the vitreous humor that are anchored to the ora serrata. These fibers prevent the vitreous humor from entering the anterior chamber (the space between the cornea and the iris).

**Why Each Wrong Option is Incorrect:**

A. The vitreous humor attaches to the lens and the retina, not the ciliary body. The ciliary body is responsible for producing aqueous humor and is not related to the attachment of the vitreous humor.

B. The vitreous humor does not attach to the cornea and iris. The cornea and iris are part of the anterior chamber and are not related to the vitreous humor attachment.

C. The vitreous humor does not attach to the sclera, which is the white outer layer of the eye and not involved in the attachment of the vitreous humor.

D. The vitreous humor attaches to the ora serrata, which is the border between the vitreous humor and aqueous humor. This option is incorrect because it is the strong attachment at the ora serrata that prevents the vitreous humor from entering the anterior chamber.

**Clinical Pearl:** Understanding the attachment of the vitreous humor is crucial to appreciate the anatomy and physiology of the eye. A misdiagnosis or error in this understanding can lead to complications such as vitreous hemorrhage or retinal detachment, which can cause vision loss or blindness if not addressed promptly.