RHO and retinitis pigmentosa 1: In their second study [30], four groups of heterozygote S334ter-4 rat retinal degeneration model (a mutation identical to the human rhodopsin mutation in RP) were created: 0.2 μg/d FAc-loaded intravitreal drug-delivery implant (IDDI), 0.5 μg/d FAc-loaded IDDI, inactive IDDI, and nonsurgical control.