This definite but rarely described clinical entity, called by various observers "melanosis of the retina," "congenital pigmentary plaques of the retina," "congenital pigmentation of the retina," and, in an excellent review of the literature by Hoeg1 in 1911, "grouped pigmentation of the retina," is probably more common than the relatively few recorded cases would lead one to suspect. Thus in seven years Hoeg saw four cases; Blake2 found seven cases in twelve years, and Stephenson3 observed the condition three times in 2,400 examinations. The three cases here described were seen in a single year; S. R. Gifford has observed two other previously unreported cases. In spite of this percentage there is very little in the literature regarding this interesting congenital anomaly, and relatively few cases have been described. Most textbooks on ophthalmology make no mention of it, although Ball4 listed it, unnamed, under "variations in
MANN WA. GROUPED PIGMENTATION OF THE RETINA. Arch Ophthalmol. 1932;8(1):66–71. doi:10.1001/archopht.1932.00820140074008
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