This is iris pigment that has settled on the anterior surface of the anatomical lens. Note the velvety or granular texture that stops at what would be the undilated pupil margin. In this patient it was a unilateral condition, reducing best corrected visual acuity to 20/25 compared with 20/20 for the fellow eye. The patient has a sibling who has the same condition, also affecting only one eye and minimally affecting vision.
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