Water content in lens is ?
**Core Concept**
The water content in the lens of the eye is an essential aspect of its transparency and refractive index. The lens is composed of a high percentage of water, which is crucial for maintaining its gel-like consistency and allowing light to pass through.
**Why the Correct Answer is Right**
The lens of the eye contains approximately 65-70% water, which is higher than that of the cornea. This high water content is due to the presence of a network of collagen fibers and elastin fibers that provide structural support while maintaining a high degree of hydration. The water content in the lens helps to maintain its transparency and refractive index, allowing it to focus light properly.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided, but the typical range for water content in the lens is between 65-70%.
* **Option B:** This option is incorrect because the water content in the lens is not as high as in other tissues, such as the vitreous humor, which contains around 99% water.
* **Option C:** This option is incorrect because the water content in the lens is not as low as in other tissues, such as bone, which contains around 25% water.
**Clinical Pearl / High-Yield Fact**
Cataract formation can occur when the water content in the lens changes, leading to a decrease in its transparency and refractive index. This can be due to various factors, including aging, trauma, or metabolic disorders.
**Correct Answer: C. 65-70%**