Importantly, genetic studies in Drosophila have helped to uncover function of several genes whose mutations cause dominant or recessive forms of RP, including crumbs (crb) (RP12), rhodopsin (rh/RHO) (RP4) and eyes shut (eys) (RP25) (Gaspar et al., 2019; Lehmann et al., 2019). The gene discussed is EYS; the disease is retinitis pigmentosa 1.