## **Core Concept**
The question tests knowledge on the clinical presentation of retinal detachment, specifically focusing on the earliest manifestation. Retinal detachment is a serious eye condition where the retina separates from the back of the eye, leading to vision loss if not promptly treated.

## **Why the Correct Answer is Right**
The correct answer, **photopsia** (or flashes of light), is an early symptom of retinal detachment. This occurs due to the mechanical pulling on the retina, which stimulates the photoreceptors and leads to the perception of flashes of light. This symptom can precede the onset of visual field defects.

## **Why Each Wrong Option is Incorrect**
- **Option A:** *Blindness* is a late and severe consequence of untreated retinal detachment, not an early manifestation.
- **Option B:** *Floaters* can be a symptom of retinal detachment but are more commonly associated with posterior vitreous detachment. While they can be an early symptom, they are not as specific or as immediately indicative of detachment as photopsia.
- **Option C:** *Visual field defect* (or loss of peripheral vision) can occur as the detachment progresses, but it typically follows the onset of photopsia.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that patients with sudden onset of **photopsia** (flashes of light) and/or new onset of **floaters** should be urgently evaluated for retinal detachment. Early detection and treatment can significantly improve outcomes.

## **Correct Answer:** . Photopsia