RPGR and myopia: Our findings also show that broad statements about predominant cone or rod dysfunction predisposing to myopia are of limited accuracy: we found that different cone dysfunction syndromes were associated with varying effects on eye growth and that longer ALs could be a feature of disease associated with a particular gene (RPGR) whether the rods or the cones degenerated first, although here an interesting difference was found between the subgroups.