**Core Concept**
Tubular vision, also known as tunnel vision, is a visual phenomenon where a person perceives a narrow, cylindrical field of vision, often accompanied by a loss of peripheral vision. This occurs due to a disruption in the normal visual processing pathways, typically as a result of a specific type of brain injury or disease.

**Why the Correct Answer is Right**
Tubular vision is commonly associated with lesions in the occipital lobe, particularly in the Meyer's loop area. The Meyer's loop is a curved bundle of axons that carries visual information from the lateral geniculate nucleus to the primary visual cortex. Damage to this area can disrupt the normal processing of visual information, leading to a narrowing of the visual field and a loss of peripheral vision.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because tubular vision is not typically associated with lesions in the frontal lobe, which is responsible for motor function and executive processing.
**Option B:** This option is incorrect because hemianopia, a condition characterized by the loss of half of the visual field, is a different visual field defect that is not typically described as tubular vision.
**Option C:** This option is incorrect because cataracts, a condition characterized by the clouding of the lens, can cause visual disturbances, but they are not typically associated with tubular vision.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that tubular vision is often associated with occipital lobe lesions, particularly in the Meyer's loop area. This knowledge can help in diagnosing and localizing visual field defects in patients with neurological disorders.

**Correct Answer:** D. Optic tract lesions