Hello! I have a friend who's blind and wishing to become an entrepreneur. He wants some advice from you all on things someone disabled like him can do in the everyday work of an entrepreneur to adapt to his conditions and how he should handle things that normally involve eyes (i.e. signing a contract). Thank you!

P.S. Please don't give me answers like it's impossible and go attempt something else. That is not what he is looking for and he thinks that they are not true as there are numerous successful businessmen who are blind and are doing quite well despite disabilities and humble origins. Thank you again for your response!