RP1 and retinitis pigmentosa 1: RP is a clinically and genetically heterogeneous group of progressive inherited retinal disorders causing retinal degeneration and affecting 1 in 3000 people.24 The clinical variation reflects differences in the age of onset, progression, retinal appearance and visual outcome.12 Pathogenic variants in RP1 often lead to a truncated protein, but a splice site variant in a long non-coding RNA was linked to Volkmann cataract, where opacities are formed around the lens sutures.25 This indicates the potential importance of RP1 to the lens as well as the retina.