<prompt> All are true about retinitis pigmentosa EXCEPTGenetic inheritance XlinkedEarly diagnosis and treatmentVisual acuity not diminished till late in courseAssociated with systemic abnormalities  <response>: 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. 