Nyctalopia is a medical condition that is commonly referred to as night blindness. It is characterised by an inability to see in low light environments or total darkness. Although the term 'nyctalopia' is specific to this condition, it is often used interchangeably with other synonyms such as nocturnal amblyopia, hemeralopia, and mesopic vision. Each of these terms is used to describe the same thing as nyctalopia, but with varying levels of severity. Hemeralopia, for example, is the opposite of nyctalopia in that it refers to a significant reduction in vision during daylight hours. Regardless of the term used, this condition affects an individual's ability to see and can have significant impacts on their overall quality of life.