Oldest lens fibres are found in ?
**Core Concept**
The question pertains to the anatomy of the lens in the human eye, specifically the organization of lens fibers in relation to age. The lens is a transparent, flexible structure behind the iris and the pupil, responsible for focusing light onto the retina. As humans age, the lens undergoes changes, including the deposition of new lens fibers.
**Why the Correct Answer is Right**
In the human lens, the oldest lens fibers are found in the **nuclear region**. This is because lens fibers are deposited in a specific pattern, with the oldest fibers being added to the center of the lens. As new fibers are deposited, the older fibers are pushed towards the periphery. This process continues throughout life, resulting in the nucleus of the lens being composed of the oldest fibers, which are densely packed and have a higher refractive index.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the **anterior capsule** is the outermost layer of the lens, and it is not composed of the oldest lens fibers.
**Option B:** This option is incorrect because the **cortical region** is composed of the outer layers of the lens, which are made up of younger lens fibers.
**Option C:** This option is incorrect because the **capsular bag** is a fluid-filled space surrounding the lens, and it is not composed of lens fibers at all.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the lens is a dynamic structure that undergoes significant changes throughout life, including the deposition of new lens fibers and the accumulation of nuclear sclerosis, which can affect vision in older adults.
**Correct Answer:** C.