**Core Concept**
The end organ for vision refers to the specialized sensory receptor cells responsible for detecting light and transmitting visual information to the brain. This process involves the transformation of light into electrical signals that are interpreted by the visual cortex.

**Why the Correct Answer is Right**
The correct answer is the retina, which is a complex tissue consisting of multiple layers of neurons and photoreceptor cells, including rods and cones. The rods are sensitive to low light levels and are responsible for peripheral and night vision, while the cones are responsible for color vision and function best in bright light conditions. The photoreceptor cells contain visual pigments that undergo a conformational change in response to light, triggering a signaling cascade that ultimately leads to the generation of electrical impulses transmitted to the optic nerve and eventually to the brain.

**Why Each Wrong Option is Incorrect**
**Option A:** The optic nerve is a bundle of axons that transmit visual information from the retina to the brain, but it is not the end organ for vision itself.
**Option B:** The cornea is a transparent layer of tissue at the front of the eye that helps to focus light, but it is not responsible for detecting light or transmitting visual information.
**Option C:** The lens is a flexible structure behind the iris that changes shape to focus light on the retina, but it is not a sensory receptor cell and does not detect light.

**Clinical Pearl / High-Yield Fact**
The retina is a highly vascularized tissue that is susceptible to damage from conditions such as diabetic retinopathy, hypertension, and age-related macular degeneration.

**Correct Answer: C. Retina. The end organ for vision is the retina.**