LOXL1 and exfoliation syndrome: Recently, in the populations of Iceland and Sweden, three single nucleotide polymorphisms (SNPs; rs2165241, rs3825942, and rs1048661) in the lysyl oxidase-like protein 1 gene (LOXL1, OMIM 153456) have been found to be strongly associated with exfoliation glaucoma (XFG, OMIM 177650), which is the most common form of secondary open-angle glaucoma associated with exfoliation syndrome (XFS; OMIM 177650) [21].