In the Victorian era, social expectations unrealistically dictated the virtually all aspects.
In Sacks, Torey's life, according to society's expectations, should be absolutely visionless, as that is what a blind person's ability to see is defined as by society. However, following this societal expectation would lead one to
In Reading Lolita in Tehran, Nafisi and her students, according to society's expectations, should be censored by the traditional veils the Islamic Republic's coerces all women to wear.
By not allowing his vision to be filtered by Victorian society's taboos, Charles Darwin was able to see the world for what it truly was. This enabled him to have full control over what he saw in the world, and what he can conclude about it.