ABSTRACT
The ocular media comprise all ‘clear’ structures of the eye through which light rays pass to reach the retina, that is, cornea, aqueous fluid, anterior chamber, lens, vitreous fluid and posterior chamber. A healthy clear ocular surface is essential for corneal refraction and transparency. Exposure keratopathy may result from facial nerve palsy in which there is incomplete eyelid closure and neurotrophic keratopathy results due to loss of corneal sensation from trigeminal nerve involvement. Trauma may directly involve the cornea with a penetrating injury or a chemical eye injury. The posterior chamber is an area behind the lens and is filled with clear fluid. Congenital anomalies include persistent primary vitreous and persistent hyperplastic primary vitreous, encompassing persistent hyaloid vasculature and mesenchymal tissue from the embryonic primary vitreous. Acquired vitreous pathology is associated with sudden painless visual loss with sensitivity to bright light and blurred vision.
