highly significantP = 1.99 × 10 –8
A cluster of variants in ANO2 (encoding anoctamin 2, a calcium-activated chloride channel expressed on photoreceptor cells) on chromosome 12 reached the level of significance for loss of ≥5 letters after 1 year of treatment ( P < 5 × 10 –8 ), with the ANO2 rs2110166 SNP demonstrating highly significant association ( P = 1.99 × 10 –8 ).