**Core Concept**
The refractive index of vitreous humor is a critical factor in determining the overall refractive power of the eye. It is the ratio of the speed of light in a vacuum to the speed of light in the vitreous humor, and it plays a crucial role in correcting vision and preventing refractive errors.

**Why the Correct Answer is Right**
The correct answer is 1.33, which is the average refractive index of the vitreous humor. This value is essential for understanding how the eye focuses light and how refractive errors occur. The vitreous humor is a clear, gel-like substance that fills the space between the lens and the retina, and its refractive index is higher than that of the surrounding aqueous humor. This difference in refractive indices helps to maintain the eye's spherical shape and enables clear vision. The exact value of 1.33 is due to the presence of water and other substances in the vitreous humor.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not match the known refractive index of vitreous humor. A refractive index of 1.00 would imply that the vitreous humor has the same refractive properties as air, which is not the case.
**Option B:** This option is incorrect because it is too high. A refractive index of 1.50 would imply that the vitreous humor is more dense than it actually is, which would affect the eye's ability to focus light correctly.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that the refractive index of the vitreous humor is relatively constant across individuals, which is why it is a crucial factor in correcting vision and preventing refractive errors.

**Correct Answer:** D. 1.33