AR and blue cone monochromacy: AR (positive vs. negative) showed a trend for a prognostic difference in BCM with 10-year FU (HR 0.56, 95% CI 0.17–1.8), but the evidence was very weak (P = 0.33), and the effect was lost when analyzed with 25-year FU (HR 0.93, 95% CI 0.29-3.0, P = 0.90) (Table 4; Online Resource 1).