In the normal human right eye, the peripheral field of vision is usually least:
**Core Concept**
The peripheral field of vision is the area of visual field outside the central or foveal area, which is responsible for sharp vision. The peripheral field of vision is typically limited by the anatomy of the eye, particularly the position and structure of the optic nerve and the retina.
**Why the Correct Answer is Right**
The peripheral field of vision is usually least in the nasal side of the eye due to the blind spot caused by the optic disc. The optic disc is the point on the retina where the optic nerve fibers exit the eye, and it does not contain photoreceptors, resulting in a blind spot. In the right eye, the nasal side of the retina is closer to the blind spot, making the peripheral field of vision less in that area.
**Why Each Wrong Option is Incorrect**
* **Option A:** This is not a valid option as it does not provide a location or description of the area with the least peripheral field of vision.
* **Option B:** This is incorrect because the temporal side of the eye typically has a wider peripheral field of vision, not a narrower one.
* **Option C:** This is incorrect because the inferior side of the eye does not have a significant structural limitation that would limit its peripheral field of vision.
**Clinical Pearl / High-Yield Fact**
The blind spot is a common exam topic and can be remembered using the mnemonic "ONE" - Optic Nerve Exit, where the optic nerve fibers exit the eye, creating a blind spot.
**Correct Answer:** . **Nasal**