The retina is the nerve layer covering the inner surface of the posterior segment of the eye. It is vitally important for vision, it contains millions of light receptors that capture light rays from our environment. It is like the film inside a camera.

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Posterior segment of the eye is filled with a jelly-like substance called the vitreous. This jelly supports the retina from the inside, and is firmly attached to the retinal surface. As we age the vitreous starts to liquefy, resulting in traction on the retina and in some cases retinal detachment.

If the retina is detached from the underlying layers, it cannot function as it has reduced blood supply. The retina detaches and starts to contract and scar, eventually leading to permanent visual loss, if not treated as soon as possible.