<unk>  occurs when fluid and protein deposits collect on or under the<unk> of the eye (a yellow central area of the retina) and causes it to thicken and swell (edema). The swelling may distort a person's central vision, because the<unk> holds tightly packed cones that provide sharp, clear, central vision to enable a person to see detail, form, and color that is directly in the centre of the field of view.
Macular edema
Corneal neovascularization
Papilledema
Cloudy cornea
Basement membrane corneal dystrophy
Band keratopathy
Interstitial keratitis
Intrastromal corneal ring segments