Editor,—I read with interest the article by Assiet al on the measurement of the papillomacular retinal nerve fibre layer thickness in long standing stage IV macular holes.1 Using the nerve fibre analyser the authors found no difference in papillomacular retinal nerve fibre layer thickness variables between healthy eyes and eyes suffering from stage IV macular holes. In their discussion the authors interpret their results as a tendency for higher readings in the macular hole group, and try to explain this unexpected finding with the potential effects of intraretinal fluid movement from the edge of the hole towards the optic disc or with mechanical deformation of the Henle's fibre …