All are true about retinitis pigmentosa EXCEPT –

Treatment is eminently unsatisfactory since nothing appears to have a decided influence upon the course of the disease. Retinitis pigmentosa shows all three pattern of inheritance, i.e., autosomal recessive (most common), autosomal dominant, sex- linked (X- linked recessive). Initially there is loss of peripheral vision and central vision is preserved till late. Retinitis pigmentosa is assoicated with many systemic syndromes.