This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
Which of the following is the earliest manifestation of retinal detachment: March 2008 
Select and explain. 
A. Feeling of cuain obscuring their field of vision, B. Floaters, C. Photopsia, D. Fall in visual acuity
C: Photopsia
Answer: C: Photopsia 
Explanation: Ans. C: Photopsia Symptoms of a shallow retinal detachment may be non-specific in the initial stages. Transient flashing lights (photopsia) in a paicular pa of the visual field, due to slight traction of the retina which irritates the neuro-epithelium, may be the initial symptom. Once retina breaks, there is release of pigment or a small hemorrhage which manifests as 'floaters' or small moving spots in the patients visual field. These float in the vitreous and cast a shadow on the retina (muscae volitantes).