[Soft hydrophilic lenses and permanent wear in optical cases. Physio-pathological considerations and conclusions].

The author has noted that the frequency of epithelial lesions appearing during the course of trials with soft hydrophilic lenses containing 40% water diminished almost completely with soft hydrophilic lenses containing 70% water. He attributes these epithelial lesions to anoxia occurring with soft hydrophilic lenses with 40% water. He compares the permeability to oxygen of different types of lenses according to their thickness. He concludes that at present the materials utilised and the thickness of the lenses do not allow permanent wear.