{{Rsnum
|rsid = 28935199
|Gene = CXorf2
|Orientation=plus
|geno1=(A;A)
|geno2=(A;G)
|geno3=(G;G)
|Chromosome=X
|position=154195934
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|Status=Merged
|Merged=104894916
|Gene_s=OPN1MW
}}[[Colorblind]]ness is typically caused by rearrangements in the region of the X chromosome harboring the green and red opsin genes. In a small number of cases, SNPs in opsin genes can also lead to colorblindness.

[[rs28935199]] is an example of such a SNP. One Japanese male homozygous for the [[rs28935199] (A) allele, which causes a change from an arginine to a glutamine in the green opsin protein at position 330, has been observed to be colorblind. {{PMID|12051694}}.{{omim
| id = 303800
| variant = 0004
| desc    = COLORBLINDNESS, DEUTAN
| rsnum   = 28935199
}}