text: A<unk>  is a hamartoma (a type of benign tumor) affecting the iris.  These<unk> s are typically found in neurofibromatosis type 1. They are clear yellow to brown, dome-shaped elevations that project from the surface of the iris.<unk> s are theorized to arise from mast cells, pigmented cells and fibroblast-like cells.  In 80% of eyes,<unk> s may be found in the inferior quadrants of the iris and this may be related to greater sun exposure, one of the postulated factors in the development of these benign tumefactions. They can be detected by an optometrist or an ophthalmologist using a slit lamp. These<unk> s do not affect vision.  They were named after Austrian ophthalmologist Karl<unk>  (1907-1999), who published an article about them in 1937.
option_0: Lisch nodule
option_1: Hampton's hump
option_2: Erlenmeyer flask deformity
option_3: Wormian bones
option_4: Unicameral bone cyst
option_5: Intraosseous lipoma
option_6: Supernumerary nipple
option_7: Ganglion cyst