Phenotype and genotype data for discovery (Map 1 and Map 2) and replication samples.

Phenotype summary: Refraction data (autorefractor and postal) for all samples (All twins), linkage replication (postal samples) and association samples (discovery = Map 1 and Map 2; replication). Association discovery = total autorefractor data used to select discovery case-controls; case-control = total number of Map 1 and Map 2 samples; Association replication = independent twin sample with autorefractor/postal spherical equivalence and Hap300 data; Pairs = number of twin pairs with complete refraction data for both siblings; SD = standard deviation (for unrelated case-controls) and between sib-pair standard deviation (for related samples). Genotype summary: Numbers of SNPs and samples genotyped; Association discovery Total = Map 1 and Map 2 coverage (total SNPs and samples); QC = Quality control; Association replication = Illumina Hap300 SNPs.