Ophthalmology

"He will reproach himself for having been the victim of some of these liabilities, but for others, like his cataract or the bad illumination, he will express regret but not remorse. That is, some of the explanations that he will give for some of his mistakes and failures will be of the same sort as the explanations he would give for his mistakes and failures in counting or multiplying, but some will be of quite different sorts, like the explanations that he couches in the terms of elementary ophthalmology or optics."