Figure 2 Relationship of best‐corrected visual acuity with the number of retinal layers identified by optical coherence tomography in the right eyes (top) and in the left eyes (bottom) of patients with retinitis pigmentosa. The more the retinal layers that can be identified, the significantly better the visual acuity (p<0.001, Kruskal–Wallis test, p<0.05, Tukey–Kramer test). LogMAR, logarithm of the minimal angle of resolution. Hand movement, light perception and no light perception are designated as 4, 5 and 6, respectively.