What mechanical effect causes flashes of light in retinal detachment?

Flashes of light experienced in retinal detachment are primarily caused by traction on the retina. During this condition, the vitreous gel that fills the eye can pull on the retina, especially at the area of the detachment or along the edges. This traction can irritate the photoreceptors in the retina, leading to the perception of light flashes, a phenomenon also known as photopsia.

Understanding the mechanics of retinal detachment is crucial. When the vitreous body contracts or shrinks, it may exert pulling forces that create a sensation of flashes of light as the retina is stimulated. This is an important clinical sign that can alert individuals to seek immediate medical attention, as retinal detachment can lead to vision loss if not treated promptly.

Other factors such as inflammation of the retina, vitreous hemorrhage, or pressure on the optic nerve may contribute to vision changes, but they do not primarily produce the characteristic flashes of light associated with retinal detachment. Hence, the traction on the retina stands out as the mechanism directly responsible for this specific symptom.