"The discovery of RdCVF (Rod-derived Cone Viability Factor) has provided a clue to understanding the secondary loss of cone photoreceptors (and of central and light-adapted vision) following the degeneration of rod photoreceptors as a consequence of mutations expressed only in rods in most cases of rod-cone degenerations (or retinitis pigmentosa : RP). In two different rodent models of RP, intraoc ...