Do myopia, hypermetropia or astigmatism hamper the practice of Phosphenism?
No, because the quantity of light received is still the same and it is this energy that matters for phosphenic mixing. Through the intense exercise of the iris caused by the alternation of strong light and darkness, phosphenic practice improves certain conditions of the eye such as synechia (the sticking of the iris to the crystalline lens). Nearsighted persons will notice a significant improvement in sharpness. The regular practice of Phosphenism improves visual sharpness by one dioptre after the first month whatever the nature of the initial deficiency. Persons wearing corrective glasses will quickly notice an improvement in their visual sharpness which could lead to them not needing correction any more. Dr Lefebure is a good example of the positive effects of phosphenic practice on eyesight. A short time before his death, at the age of 72, he could read texts at a normal distance without glasses during lectures. This is quite remarkable as it is has been proved that presbyopia start
