Are sighted people disabled?
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Missy
Mystic Dawn
Brandon Cross
Mystic Dawn
Dedicated Wildcat Man
Rev-jam
Literophilus
A clarifying way to look at disability is as an irregular characteristic, or a set of characteristics, expressed within an individual of the species that cannot account for adaptation deriving from pressures of the immediate ecosystem. In other words, disability emerges when an individual's traits hinder their ability to effectively adjust to the environmental demands faced by their species. These characteristics do not serve as functional adaptations to the immediate ecological pressures, setting them apart from the typical variations that might support survival or everyday functioning within the context of that environment.
Literophilus
I believe it is necessary to distinguish between modes of the real. Let’s take just three modes, biological, social, and symbolic. Your examples fit in the three perfectly. Biologically speaking sighted people wouldn’t adjust to the disabled category because of phylogenetics, meaning that as a species, any primate evolved to use the most relevant sense in their perceptual system, the sight, necessary to survive hundreds of thousands of year to avoid predators, etc. Secondly, to some extent you are right when it comes to the social mode of the real because in all likelihood, 200 years ago people probably felt more comfortable with darkness, so this is more a behavior shaped by modern technology, etc. Even though, this wouldn’t qualified as disabled, rather it would inform of the attunement between the species and the environment in today’s world. Lastly, symbolically, people are afraid of darkness at a subconscious level for obvious reasons, serpents, predators, scorpions, etc. in a cave would show the degree of our vulnerability. It isn’t darkness itself as a physical phenomena, but what it means for a truly vulnerable primate: therefore, people try to avoid darkness, it is in the books, literature, stories, etc., it is the symbolic mode deeply ingrained in human mind.
Allure
King Tripple Whopper
Meg
I wouldn’t say depression is a disability but it kind of makes me think of the same thing. Some people see it as oh if you’re sad for an hour that your dog died then you’re depressed but sadness and depression are very different things. 
Pat
I say no. The contention is a bit of a stretch. 
King Tripple Whopper
Another example is that blind people can not drive whereas sided people can because of human biology! They can simply physically see the road and various other elements, whereas blind people cannot and do not have any understanding of visual concepts in the physical world. 
King Tripple Whopper
I get what you’re trying to say, but that argument doesn’t really hold up. A disability isn’t just about needing help sometimes—it’s about a consistent limitation in major life functions. For example, blind folks navigate the world without sight every single day, not just in the dark or under certain conditions. Sighted people might need a flashlight at night, but that’s not the same as living without vision overall. So yeah, blindness is an actual functional impairment, while needing light to see in darkness is just how human biology works. 
Rebecca
Insanity-Clause