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Cataracts cause 51% of all cases of blindnessand 33% of visual impairmentworldwide. [3][9] Cataracts are most commonly due to agingbut may also occur due to traumaor radiation exposure, be present from birth, or occur following eye surgery for other problems. [1][4]Risk factors include diabetes, longstanding use of corticosteroidmedication ...
Retinoblastoma (Rb) is a rare form of cancer that rapidly develops from the immature cells of a retina, [ 2] the light-detecting tissue of the eye. [ 3] It is the most common primary malignant intraocular cancer in children, especially those under 3 years old. [ 4][ 5] Though most children in high income countries survive this cancer, [ 2] they ...
Cataract surgery is the most common application of lens removal surgery, and is usually associated with lens replacement. It is used to remove the natural lens of the eye when it has developed a cataract, a cloudy area in the lens that causes visual impairment. [ 4][ 10] Cataracts usually develop slowly and can affect one or both eyes. [ 4]
Conjunctivitis. Conjunctivitis, also known as pink eye, [ 4] is inflammation of the outermost layer of the white part of the eye and the inner surface of the eyelid. [ 5] It makes the eye appear pink or reddish. [ 1] Pain, burning, scratchiness, or itchiness may occur. [ 1] The affected eye may have increased tears or be "stuck shut" in the ...
Myopia. Myopia, also known as near-sightedness and short-sightedness, [ 5] is an eye disease [ 6][ 7][ 8] where light from distant objects focuses in front of, instead of on, the retina. [ 1][ 2][ 7] As a result, distant objects appear blurry while close objects appear normal. [ 1]
Uveitis. Uveitis ( / ˌjuːvi.aɪtɪs /) is inflammation of the uvea, the pigmented layer of the eye between the inner retina and the outer fibrous layer composed of the sclera and cornea. [1] The uvea consists of the middle layer of pigmented vascular structures of the eye and includes the iris, ciliary body, and choroid.
Photograph manipulation involves the transformation or alteration of a photograph. Some photograph manipulations are considered to be skillful artwork, while others are considered to be unethical practices, especially when used to deceive. Motives for manipulating photographs include political propaganda, altering the appearance of a subject ...
Blood is composed of blood cells suspended in blood plasma. Plasma, which constitutes 55% of blood fluid, is mostly water (92% by volume), [ 2] and contains proteins, glucose, mineral ions, and hormones. The blood cells are mainly red blood cells (erythrocytes), white blood cells (leukocytes), and (in mammals) platelets (thrombocytes). [ 3]