**Core Concept**
Visual hallucinations refer to the perception of visual stimuli that are not present in the external environment. This phenomenon is often associated with alterations in brain regions responsible for processing visual information, such as the primary visual cortex and higher-order visual areas.

**Why the Correct Answer is Right**
Visual hallucinations are commonly seen in conditions that affect the brain's visual processing pathways, particularly those involving the temporal lobe, thalamus, and visual cortex. The most notable example is Charles Bonnet syndrome, a condition characterized by complex visual hallucinations in individuals with vision loss, often due to age-related macular degeneration or cataracts. Additionally, visual hallucinations can occur in psychiatric disorders such as schizophrenia, as well as in neurological conditions like temporal lobe epilepsy.

**Why Each Wrong Option is Incorrect**
**Option A:** Temporal lobe seizures may cause complex visual hallucinations, but this is not the most common association.
**Option B:** While certain medications can cause visual disturbances, this option is too broad and nonspecific.
**Option C:** Parkinson's disease can cause visual hallucinations, but this is not the most common association.

**Clinical Pearl / High-Yield Fact**
Visual hallucinations in patients with vision loss are often benign and can be treated with reassurance and, if necessary, antipsychotic medications.

**Correct Answer:** C.