Peters anomaly is a rare congenital form of anterior segment dysgenesis in which abnormal cleavage of the anterior chamber occurs. It is characterized by a central corneal opacity (leukoma) due to defects in the posterior stroma, Descemet membrane, and endothelium. [1, 2, 3, 4, 5]
Peters anomaly is differentiated into 2 types: the milder type 1 Peters anomaly, which typically does not include the lens, and the more severe type 2 Peters anomaly, in which the lens adheres to the cornea (keratolenticular adhesions).  Peters anomaly may also be associated with systematic abnormalities. [6, 7]
Peters anomaly type 1 presents with central or paracentral corneal opacity and iridocorneal adhesions. Keratolenticular adhesions are absent in this type, although the lens may be cataractous.
Peters anomaly type 2 is commonly associated with a denser corneal opacification. It presents with keratolenticular adhesions.
Peters anomaly is bilateral in 60%-80% of cases.  It may be associated with other abnormalities of the eye, including congenital glaucoma, myopia, aniridia, iris coloboma, microphthalmos, persistent hyperplasia of primary vitreous (PHPV), and optic disc hypoplasia. [11, 12]
Systemic associations with Peters anomaly include trisomy 13-15, partial deletion of chromosome arm 11q, and Norrie disease. Peters plus syndrome is characterized by cleft lip or palate, short stature, facial dysmorphism, genitourinary abnormalities, syndactyly, brachycephaly, and cardiac, neural, and hearing abnormalities. [6, 13]
The incidence of Peters anomaly in the United States is estimated to be 44-60 cases annually. 
The incidence of Peters anomaly outside the United States is unknown.
In addition to corneal opacity and cataract, glaucoma and deprivation amblyopia may increase morbidity. 
Peters anomaly has no known racial predilection.
Peters anomaly has no known sexual predilection.
Peters anomaly manifests in utero during the first trimester of pregnancy (10-16 weeks' gestation) and is therefore noted at birth. The anterior segment is formed completely by the 10th week of gestation, and, by the 16th week, most of the Descemet membrane is formed.
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