Metamorphopsia or distorted vision is a clinical sign that usually indicates an affectation of central retina, known as macula. Distorted vision can be caused by a large number of macular diseases such as: Ager-related macular degeneration Macular hole Epiretinal membrane Macular oedema Central serous chorioretinopathy Polypoidal vasculopathy Intraocular inflammations … The monitorisation of this symptom by patients is essential for once metamorphopsia appears or changes from a basal state, it is important to go to the ophthalmologist’s to control the fundus. In order to check metamorphopsia we advise using the Amsler Grid Test. It is a square with horizontal and vertical lines forming several little squares inside and a black dot in the middle of it. If you wish to try this test, you must cover one eye with your hand and stare at the black dot in the centre of the grid. Right then, you must pay attention to the morphology of the nearby squares. Should their lines appear distorted or the squares not have their proper shape, it is probable that you suffer from metamorphopsia. Once you have finished testing one eye, you must try the other one.