Malfunctions of RBP3 are believed to contribute to the pathologies of several retinal diseases [6], including diabetic retinopathy (DR) [16–18], retinitis pigmentosa (RP) [19,20], pan-retinal degeneration [21] and exaggerated eye growth and myopia [22–25]. Here, RBP3 is linked to retinitis pigmentosa 1.