Table 1. Clinical features of all the subjects.

Subject ID	Gender	Age in years	Age of onset of symptoms in years	Earliest symptom	Current symptoms	Current best-corrected visual acuity		Refractive error	Colour vision—Ishihara	Fundus changes
						Right	Left
IV:1	Female	21	11	Reduced central vision	Photoaversion	6/18	6/18	Myopia	0/17	Mild macular mottling
III:2	Female	44	23	Reduced central vision	Photoaversion	2/60	3/60	None	0/17	Perifoveal retinal thinning
III:3	Female	44	12	Reduced central vision	Loss of colour and central vision, photoaversion	3/60	1/60	Myopia	0/17	Perifoveal retinal thinning
II:1	Male	68	Asymptomatic	Never	None	2/60	6/18	Myopia	Not available	Peripapillary atrophy
II:2	Female	65	Asymptomatic	Never	None	6/6	6/6	None	17/17	None