**Core Concept**
Optical media refer to the structures within the eye that are responsible for transmitting light, including the cornea, aqueous humor, lens, and vitreous humor. In certain conditions, these media may become cloudy or opaque, impairing vision.

**Why the Correct Answer is Right**
In cavernous sinus thrombosis, the infection spreads from the face or orbit to the cavernous sinus, leading to inflammation and thrombosis. However, the optical media remain clear due to the absence of direct infection or inflammation within these structures. On the other hand, orbital cellulitis is an infection of the orbital tissues, which can cause inflammation and potentially lead to clouding of the optical media. However, in some cases, the inflammation may be limited to the orbital tissues, leaving the optical media clear.

**Why Each Wrong Option is Incorrect**
**Option A:** Cavernous sinus thrombosis does not directly affect the optical media, as the infection is located outside the eye.
**Option B:** Orbital cellulitis can lead to clouding of the optical media in some cases, but it is not a universal finding, and in some instances, the media may remain clear.
**Option D:** The correct answer is actually **C. Both of the above**, so this option is incorrect by definition.

**Clinical Pearl / High-Yield Fact**
It's essential to distinguish between cavernous sinus thrombosis and orbital cellulitis, as the former may present with proptosis, ophthalmoplegia, and a palpable mass behind the eye, whereas the latter may present with periorbital edema, pain, and decreased vision.

✓ Correct Answer: C. Both of the above