Figure 3: Representative optical coherence tomography images of the parafoveal flow density.

Representative images of parafoveal flow density in the superficial (a,c,e,g,i,k) and deep (b,d,f,h,i,j,l) layers in five patients (a–j) and one control (k,l). The grid is composed of two circles centred around the fovea: an inner circle with a diameter of 1.0 mm and an outer circle with a diameter of 2.5 mm. The parafoveal region was defined as the ring between the inner and outer circles. Images of the superficial (a) and deep (b) layers of an 18-year-old female retinitis pigmentosa (RP) patient with an axial length (AL) of 23.98 mm and a parafoveal flow density of 46.94% and 53.21%, respectively. Images of the superficial (c) and deep (d) layers of a 21-year-old male RP patient with an AL of 25.10 mm and a parafoveal flow density of 46.78% and 53.83%, respectively. Images of the superficial (e) and deep (f) layers of a 44-year-old female RP patient with an AL of 24.77 mm and a parafoveal flow density of 43.66% and 51.82%, respectively. Images of the superficial (g) and deep (h) layers of a 62-year-old male RP patient with an AL of 24.55 mm and a parafoveal flow density of 41.64% and 50.88%, respectively. Images of the superficial (i) and deep (j) layers of a 62-year-old male RP patient with an AL of 23.97 mm and a parafoveal flow density of 53.85% and 59.23%, respectively. Images of the superficial (k) and deep (l) layers of a 44-year-old male control with an AL of 24.33 mm and a parafoveal flow density of 58.56% and 64.53%, respectively.