“…These include pigmented paravenous retinochoroidal atrophy,5 helicoid parapapillary chorioretinal degeneration,6 sector retinitis pigmentosa,7 retinitis punctata albescens,8 and retinitis pigmentosa sine pigmento. 9 Morphological classification of the pigmented retinopathies is a convenient method for separating the various forms of RP clinically, and when a fundus pattern is always inherited in the same fashion it is strong evidence supporting a single disease process. However, subsequent research will have to demonstrate which morphological types consistently have the same aetiology, since difference aetiologies may give rise to the same clinical appearance.…”